The South Surrenders: Conclusion to the Civil War

Surrounded by Idiots

Be aware of your surroundings

urban problems in the developed world/problems that arise from the growth of developing countries/impact on surrounding areas as cities expand

Study Guide Module 2 MODULE 2 STUDY GUIDE The Integumentary System ⸻ CHAPTER 1: OVERVIEW OF THE INTEGUMENTARY SYSTEM Components of the Integumentary System The integumentary system consists of: * Skin * Hair * Nails * Sweat glands * Sebaceous glands The skin is the largest organ in the body. Functions of the Integumentary System 1. Protection 2. Sensation 3. Thermoregulation 4. Vitamin D synthesis 5. Communication ⸻ CHAPTER 2: LAYERS OF THE SKIN The skin has two major layers: Epidermis * Superficial layer * Keratinized stratified squamous epithelium * Avascular Dermis * Deeper layer * Connective tissue * Contains blood vessels, nerves, glands, and hair follicles Hypodermis * Not technically part of the skin * Also called subcutaneous layer * Contains adipose tissue Functions: * Energy storage * Cushioning * Insulation * Anchoring skin ⸻ CHAPTER 3: EPIDERMIS Cell Types Keratinocytes * Most abundant cells * Produce keratin Melanocytes * Produce melanin * Protect against UV radiation Tactile (Merkel) Cells * Touch receptors Dendritic Cells * Immune defense * Phagocytize pathogens ⸻ EPIDERMAL LAYERS Deep → Superficial Stratum Basale * Deepest layer * Single layer of cuboidal cells * Contains stem cells * Contains melanocytes * Contains tactile cells * Site of mitosis Stratum Spinosum * 8–10 layers thick * Contains dendritic cells * Connected by desmosomes Stratum Granulosum * 3–5 layers * Keratinization begins * Cells flatten * Organelles begin breaking down Stratum Lucidum * Only in thick skin * Palms and soles * Dead transparent cells Stratum Corneum * 15–30 layers * Dead keratinized cells * Protection from abrasion * Prevents dehydration ⸻ THICK VS THIN SKIN Thick Skin Found on: * Palms * Soles Contains: * Stratum lucidum Thin Skin Found everywhere else Does not contain: * Stratum lucidum ⸻ EPIDERMAL WATER BARRIER Located between: * Stratum spinosum * Stratum granulosum Functions: * Waterproofing * Prevents dehydration * Prevents excess water entry Components: 1. Filaggrin 2. Lamellar proteins 3. Lamellar lipids 4. Tight junction proteins ⸻ CHAPTER 4: DERMIS Made of connective tissue. Papillary Layer Contains: * Areolar connective tissue * Dermal papillae * Capillaries * Tactile corpuscles (Meissner corpuscles) Function: * Light touch sensation Reticular Layer Contains: * Dense irregular connective tissue * Hair follicles * Sweat glands * Sebaceous glands * Arrector pili muscles * Lamellated (Pacinian) corpuscles Function: * Deep pressure * Vibration sensation ⸻ DERMAL FIBERS Collagen Provides: * Strength * Support * Water retention Elastin Provides: * Elasticity * Stretching ability ⸻ CHAPTER 5: PIGMENTATION Melanin Produced by: * Melanocytes Functions: * Skin color * UV protection Effects of UV Exposure UV stimulates: * Keratinocytes * Melanocytes Result: * Increased melanin production * Tanning ⸻ Disorders of Pigmentation Albinism Cause: * Lack of melanin production Effects: * Pale skin * Light sensitivity * Increased skin cancer risk Vitiligo Cause: * Loss of melanocyte activity Effects: * White patches on skin ⸻ CHAPTER 6: FUNCTIONS OF THE SKIN Protection Protects against: * Microorganisms * Chemicals * UV radiation * Water loss * Physical trauma Dermicidin: * Antimicrobial substance in sweat ⸻ Sensory Function Skin detects: * Touch * Pain * Temperature * Pressure * Vibration Receptors Meissner Corpuscles * Light touch Pacinian Corpuscles * Deep pressure * Vibration Tactile Cells * Touch Hair Root Plexus * Detects hair movement ⸻ Thermoregulation When Body Is Hot Blood vessels: * Dilate Sweat glands: * Increase secretion Result: * Cooling When Body Is Cold Blood vessels: * Constrict Result: * Conserves heat Can lead to: * Frostbite ⸻ Vitamin D Synthesis UV exposure stimulates vitamin D production. Vitamin D helps: * Calcium absorption * Bone health * Immune function Deficiency causes: Rickets Children Osteomalacia Adults ⸻ Communication Examples: * Facial expressions * Goosebumps * Sweating * Hair patterns ⸻ CHAPTER 7: HAIR Hair Structure Hair Shaft Visible portion Hair Root Embedded portion Hair Follicle Surrounds root Hair Bulb Growth region Hair Matrix Mitotic cells Hair Papilla Blood supply ⸻ Hair Layers 1. Medulla 2. Cortex 3. Cuticle ⸻ Hair Functions * Protection * Thermoregulation * Sensation * Communication ⸻ Hair Growth Average: * 0.3 mm/day Normal loss: * About 50 hairs/day ⸻ Hair Color Determined by: * Melanin Gray hair: * Reduced melanin production ⸻ Arrector Pili Muscle Functions: * Causes goosebumps * Helps retain heat Controlled by: * Sympathetic nervous system ⸻ Alopecia Definition: * Hair loss Pattern baldness: * Hormonal and genetic ⸻ CHAPTER 8: NAILS Functions: * Protection * Support for grasping Structures: * Nail body * Nail root * Nail matrix * Nail bed * Lunula * Cuticle (eponychium) * Hyponychium ⸻ CHAPTER 9: GLANDS Eccrine Sweat Glands Location: * Most of body Functions: * Thermoregulation Secrete: * Water * Salt * Waste products ⸻ Apocrine Sweat Glands Location: * Armpits * Genital regions Characteristics: * Empty into hair follicles * Produce odor after bacterial breakdown ⸻ Sebaceous Glands Produce: * Sebum Functions: * Lubricates skin * Waterproofs skin * Prevents drying * Antibacterial effects ⸻ CHAPTER 10: SKIN CANCER Basal Cell Carcinoma Origin: * Stratum basale Characteristics: * Most common * Least likely to metastasize ⸻ Squamous Cell Carcinoma Origin: * Stratum spinosum Characteristics: * More aggressive * Can metastasize ⸻ Melanoma Origin: * Melanocytes Characteristics: * Most deadly * Highly metastatic ABCDE Rule A = Asymmetry B = Border irregularity C = Color variation D = Diameter > 6 mm E = Evolving ⸻ CHAPTER 11: SKIN DISORDERS Eczema Symptoms: * Dry skin * Itching * Rash * Inflammation Treatment: * Moisturizers * Corticosteroids ⸻ Acne Cause: * Excess sebum * Keratin buildup * Bacterial infection Common locations: * Face * Chest * Back ⸻ CHAPTER 12: WOUND HEALING Steps: 1. Clot Formation Stops bleeding 2. Scab Formation 3. Fibroblast Activity Produces collagen 4. Capillary Growth 5. Epidermal Repair ⸻ CHAPTER 13: BURNS First-Degree Burn Damage: * Epidermis only Symptoms: * Redness * Pain ⸻ Second-Degree Burn Damage: * Epidermis + part of dermis Symptoms: * Blisters * Swelling * Pain ⸻ Third-Degree Burn Damage: * Epidermis * Dermis * Hypodermis Characteristics: * Nerve destruction * Often painless initially * Requires grafting ⸻ Rule of Nines Head and neck = 9% Each arm = 9% Each leg = 18% Trunk = 36% Genitalia = 1% ⸻ CHAPTER 14: SCARS Scar Tissue Produced by: * Fibroblasts Contains: * Collagen Lacks: * Hair follicles * Sweat glands * Sebaceous glands ⸻ Keloid Raised scar due to excessive collagen Atrophic Scar Sunken scar Examples: * Acne scars * Chickenpox scars ⸻ CHAPTER 15: PRESSURE AND FRICTION INJURIES Bedsores Cause: * Prolonged pressure Result: * Reduced blood flow * Tissue death ⸻ Stretch Marks Cause: * Rapid growth * Pregnancy * Weight gain ⸻ Calluses Cause: * Repeated friction Result: * Thickened epidermis ⸻ Corns Specialized calluses ⸻ Blisters Cause: * Friction Result: * Fluid accumulation between skin layers ⸻ CHAPTER 16: AGING AND THE INTEGUMENTARY SYSTEM Changes: Epidermis * Thinner * Slower cell division Dermis * Less collagen * Less elastin * Slower healing Hypodermis * Fat redistribution * Less cushioning Hair * Thinner * Grayer Nails * Slower growth * More brittle Glands * Less sweat * Less sebum Skin * Wrinkles * Sagging * Dryness ⸻ HIGH-YIELD EXAM FACTS Epidermal Layers Basale → Spinosum → Granulosum → Lucidum → Corneum Touch Receptors * Meissner = Light touch * Pacinian = Pressure/Vibration Pigment Cell * Melanocyte Immune Cell * Dendritic Cell Touch Cell * Merkel (Tactile) Cell Cancer Origins * Basal Cell Carcinoma = Stratum Basale * Squamous Cell Carcinoma = Stratum Spinosum * Melanoma = Melanocytes Sweat Glands * Eccrine = Cooling * Apocrine = Odor Burn Depths * 1st = Epidermis * 2nd = Epidermis + Dermis * 3rd = Epidermis + Dermis + Hypodermis Vitamin D Deficiency * Rickets * Osteomalacia This should cover essentially all of the major concepts from the four readings and is the type of material most likely to appear on a Module 2 Anatomy & Physiology exam

CBNS 106 Final Lecture 3 Center Surround antagonism

Theory surrounding JVM 2

U.S. History Final Exam Study Guide 1. Columbus Christopher Columbus was an Italian explorer who sailed for Spain in 1492. He was searching for a westward route to Asia but instead reached the Caribbean. His voyage began long-term European exploration and colonization of the Americas. Columbus’s arrival also led to major consequences for Native Americans, including disease, conquest, forced labor, and cultural destruction. 2. Columbian Exchange The Columbian Exchange was the transfer of plants, animals, people, diseases, and ideas between Europe, Africa, and the Americas after 1492. Europeans brought horses, cattle, wheat, and diseases like smallpox. The Americas sent corn, potatoes, tomatoes, tobacco, and cacao to Europe. It changed diets, economies, populations, and environments around the world. 3. Jackson and the Bank Andrew Jackson opposed the Second Bank of the United States because he believed it gave too much power to wealthy elites. He thought the bank was unfair to common people and harmful to democracy. Jackson vetoed the bill to renew the bank’s charter and removed federal money from it. This became known as the “Bank War.” 4. Jamestown Jamestown was founded in 1607 in Virginia and was the first permanent English settlement in North America. The settlers struggled with disease, starvation, poor leadership, and conflict with Native Americans. The colony survived partly because of tobacco farming. Jamestown became important because it showed England could establish colonies in America. 5. John Smith / John Rolfe John Smith helped Jamestown survive by enforcing discipline with the rule, “He who does not work shall not eat.” He also built relationships with local Native Americans. John Rolfe introduced a successful type of tobacco, which became Jamestown’s main cash crop. Rolfe also married Pocahontas, helping create a short period of peace. 6. Middle Passage The Middle Passage was the forced journey of enslaved Africans across the Atlantic Ocean to the Americas. Conditions on ships were brutal, overcrowded, and deadly. Many Africans died from disease, starvation, abuse, or suicide. It was part of the triangular trade system and a major part of the growth of slavery in the Americas. 7. Bacon’s Rebellion Bacon’s Rebellion happened in Virginia in 1676. Nathaniel Bacon led poor farmers, indentured servants, and others against Governor Berkeley. They were angry about lack of protection from Native American attacks and unfair treatment by wealthy landowners. After the rebellion, plantation owners relied more on enslaved Africans instead of indentured servants. 8. Mayflower Compact The Mayflower Compact was signed in 1620 by the Pilgrims before they settled at Plymouth. It created a basic form of self-government. The signers agreed to make and follow laws for the good of the colony. It is important because it was an early example of democracy and majority rule in America. 9. Pilgrims & Puritans Pilgrims were Separatists who wanted to completely break away from the Church of England. They settled Plymouth in 1620. Puritans wanted to reform or “purify” the Church of England and settled mostly in Massachusetts Bay. Both groups came for religious reasons, but the Puritans created a larger and stricter society. 10. Age of Jackson Presidents The Age of Jackson refers mainly to Andrew Jackson’s presidency and the expansion of democracy for white men. Voting rights expanded as property requirements were removed for many white males. Jackson presented himself as a champion of the common man. However, this era also included Indian removal, the Bank War, and growing sectional conflict. 11. Stamp Act The Stamp Act of 1765 was a British tax on paper goods such as newspapers, legal documents, and playing cards. Colonists were angry because they had no representatives in Parliament. This led to the slogan “No taxation without representation.” Colonial protests helped force Britain to repeal the law. 12. American System The American System was an economic plan supported by Henry Clay. It included protective tariffs, a national bank, and internal improvements such as roads and canals. Its goal was to strengthen the U.S. economy and connect different regions. It showed the federal government taking a stronger role in economic growth. 13. Boston Massacre The Boston Massacre happened in 1770 when British soldiers fired into a crowd of colonists, killing five people. Colonists used the event as propaganda against Britain. Paul Revere’s engraving made the British look cruel and violent. It increased anger and tension between Britain and the colonies. 14. Boston Tea Party The Boston Tea Party happened in 1773. Colonists protested the Tea Act by dumping British tea into Boston Harbor. They were angry because Britain gave the British East India Company special advantages. Britain responded with the Intolerable Acts, which punished Massachusetts. 15. Declaration of Independence The Declaration of Independence was adopted on July 4, 1776. It announced that the colonies were separating from Britain. Thomas Jefferson wrote most of it. The document argued that people have natural rights and that government gets power from the consent of the governed. 16. Unalienable Rights Unalienable rights are rights that cannot be taken away. In the Declaration of Independence, these include “life, liberty, and the pursuit of happiness.” The idea came from Enlightenment thinkers like John Locke. These rights were used to justify independence from Britain. 17. Common Sense / Thomas Paine Common Sense was a pamphlet written by Thomas Paine in 1776. It argued that the colonies should become independent from Britain. Paine used simple language so ordinary people could understand. It helped convince many colonists to support independence. 18. Articles of Confederation The Articles of Confederation were America’s first national government. They created a weak central government because Americans feared tyranny. Congress could not tax, regulate trade well, or enforce laws effectively. Its weaknesses led to the creation of the Constitution. 19. Shays’ Rebellion Shays’ Rebellion was a farmers’ rebellion in Massachusetts in 1786–1787. Farmers were angry about debt, taxes, and losing their farms. The weak national government could not respond effectively. This showed the problems of the Articles of Confederation and encouraged leaders to write the Constitution. 20. Lexington and Concord / “Shot Heard ’Round the World” The Battles of Lexington and Concord happened in April 1775. They were the first battles of the American Revolution. British troops went to seize colonial weapons, but colonial militias resisted. The “shot heard ’round the world” refers to the first shot that began the Revolution. 21. Bunker Hill The Battle of Bunker Hill happened in 1775 near Boston. The British won, but they suffered heavy casualties. The battle proved that colonial forces could fight against the powerful British army. It gave colonists confidence early in the Revolution. 22. Saratoga / Ben Franklin The Battle of Saratoga in 1777 was a major American victory. It is considered the turning point of the Revolutionary War. After Saratoga, France agreed to support the Americans. Benjamin Franklin helped negotiate the French alliance, which provided money, troops, and naval support. 23. Yorktown The Battle of Yorktown happened in 1781. American and French forces trapped British General Cornwallis in Virginia. The French navy blocked British escape by sea. Cornwallis surrendered, effectively ending the Revolutionary War. 24. Alexander Hamilton / Economic Plan Alexander Hamilton was the first Secretary of the Treasury. His economic plan included paying off national debt, creating a national bank, and supporting manufacturing. He wanted a strong federal government and strong economy. His plan helped stabilize the new nation but caused political conflict. 25. Whiskey Rebellion The Whiskey Rebellion happened in 1794 when farmers protested a tax on whiskey. President George Washington sent federal troops to stop the rebellion. This showed that the new Constitution gave the federal government power to enforce laws. It was a contrast to the weakness shown during Shays’ Rebellion. 26. Washington’s Farewell Address Washington’s Farewell Address warned Americans against political parties and permanent foreign alliances. He believed political parties could divide the nation. He also wanted the U.S. to avoid being pulled into European conflicts. His advice influenced American foreign policy for many years. 27. James K. Polk James K. Polk was president from 1845 to 1849. He strongly supported Manifest Destiny and westward expansion. During his presidency, the U.S. gained Oregon territory and fought the Mexican-American War. The U.S. gained a large amount of land, including California and the Southwest. 28. William Henry Harrison William Henry Harrison was the 9th president of the United States. He was known as a military hero from the Battle of Tippecanoe. He gave a very long inaugural speech in cold weather and died about a month later. He had the shortest presidency in U.S. history. 29. Constitution The Constitution is the supreme law of the United States. It replaced the Articles of Confederation and created a stronger federal government. It established three branches: legislative, executive, and judicial. It also created checks and balances to prevent one branch from becoming too powerful. 30. Preamble to the Constitution The Preamble is the introduction to the Constitution. It begins with “We the People.” It explains the goals of the government, such as forming a more perfect union, establishing justice, ensuring peace, providing defense, promoting general welfare, and securing liberty. 31. The Republican Party The Republican Party was founded in the 1850s. It opposed the spread of slavery into western territories. Abraham Lincoln was the first Republican president. The party’s rise showed how slavery was becoming the central political issue before the Civil War. 32. Three-Fifths Compromise The Three-Fifths Compromise was made at the Constitutional Convention. It said that enslaved people would count as three-fifths of a person for representation and taxation. Southern states wanted enslaved people counted for more representation. This compromise increased Southern political power while protecting slavery. 33. Checks and Balances Checks and balances allow each branch of government to limit the power of the others. For example, the president can veto laws, Congress can override vetoes, and the Supreme Court can declare laws unconstitutional. This system prevents any one branch from becoming too powerful. 34. Intolerable Acts The Intolerable Acts were passed by Britain after the Boston Tea Party. They punished Massachusetts by closing Boston Harbor and limiting self-government. Colonists saw these acts as unfair and oppressive. They helped unite the colonies against Britain. 35. Bill of Rights The Bill of Rights is the first ten amendments to the Constitution. It protects individual freedoms such as speech, religion, press, assembly, and the right to bear arms. It was added to satisfy Anti-Federalists who feared a strong central government. 36. Impressment Impressment was the British practice of forcing American sailors into the British navy. It angered Americans and violated U.S. neutrality. Impressment was one of the major causes of the War of 1812. 37. Judicial Review / Marbury v. Madison Judicial review is the power of the Supreme Court to declare laws unconstitutional. It was established in Marbury v. Madison in 1803. Chief Justice John Marshall strengthened the power of the Supreme Court through this decision. 38. James Madison James Madison is known as the “Father of the Constitution” because he helped design the U.S. government. He also helped write the Federalist Papers and the Bill of Rights. As president, he led the country during the War of 1812. 39. War of 1812 / Battle of New Orleans The War of 1812 was fought between the United States and Britain. Causes included impressment, trade restrictions, and British support for Native American resistance. The Battle of New Orleans was fought after the peace treaty had been signed, but news had not arrived. Andrew Jackson became a national hero because of the victory. 40. Monroe Doctrine The Monroe Doctrine was announced in 1823 by President James Monroe. It warned European nations not to colonize or interfere in the Americas. In return, the U.S. would stay out of European affairs. It showed growing American confidence in foreign policy. 41. John Quincy Adams / Corrupt Bargain John Quincy Adams became president after the election of 1824. No candidate won a majority, so the House of Representatives decided the election. Henry Clay supported Adams and later became Secretary of State. Andrew Jackson’s supporters called this a “corrupt bargain.” 42. Manifest Destiny Manifest Destiny was the belief that the United States was destined to expand across North America. It encouraged westward expansion. Supporters saw expansion as progress, but it led to Native American removal, war with Mexico, and conflict over slavery. 43. Trail of Tears / Indian Removal Act The Indian Removal Act of 1830 allowed the federal government to move Native Americans west of the Mississippi River. The Trail of Tears refers especially to the forced removal of the Cherokee. Thousands died from hunger, disease, and exposure. It is one of the darkest examples of U.S. expansion. 44. Worcester v. Georgia Worcester v. Georgia was an 1832 Supreme Court case. The Court ruled that Georgia had no authority over Cherokee land. However, President Andrew Jackson did not enforce the ruling. The Cherokee were still forced to move west. 45. Missouri Compromise The Missouri Compromise was passed in 1820. Missouri entered as a slave state, and Maine entered as a free state. It also banned slavery north of the 36°30′ line in the Louisiana Territory. It temporarily balanced free and slave states but did not solve the slavery issue. 46. Alamo The Alamo was a mission in San Antonio, Texas, where Texan defenders fought Mexican forces in 1836. The defenders were defeated, but the battle became a symbol of resistance. “Remember the Alamo” became a rallying cry during the Texas Revolution. 47. Kansas-Nebraska Act The Kansas-Nebraska Act of 1854 allowed settlers in Kansas and Nebraska to decide whether to allow slavery through popular sovereignty. It repealed the Missouri Compromise line. It led to violence in Kansas, known as “Bleeding Kansas,” and increased sectional conflict. 48. Harriet Tubman Harriet Tubman escaped slavery and became a leader in the Underground Railroad. She helped many enslaved people escape to freedom. During the Civil War, she also served as a nurse, spy, and scout for the Union. She became a symbol of courage and resistance to slavery. 49. Seneca Falls Convention The Seneca Falls Convention was held in 1848 in New York. It was the first major women’s rights convention in the United States. Leaders included Elizabeth Cady Stanton and Lucretia Mott. The convention demanded women’s rights, including the right to vote. 50. John Brown John Brown was a radical abolitionist who believed slavery must be ended by force. In 1859, he led a raid on Harpers Ferry to start a slave rebellion. The raid failed, and Brown was executed. His actions increased tension between North and South before the Civil War. 51. Fugitive Slave Act The Fugitive Slave Act was part of the Compromise of 1850. It required citizens to help capture escaped enslaved people. It also punished people who helped freedom seekers. Many Northerners were angered by the law because it forced them to participate in slavery. 52. Harriet Beecher Stowe / Uncle Tom’s Cabin Harriet Beecher Stowe wrote Uncle Tom’s Cabin in 1852. The novel showed the cruelty of slavery and became very popular in the North. It helped increase abolitionist feelings. Southerners criticized it and argued that it gave a false picture of slavery. 53. Dred Scott v. Sandford Dred Scott v. Sandford was an 1857 Supreme Court case. The Court ruled that enslaved people were not citizens and could not sue in court. It also said Congress could not ban slavery in the territories. This decision angered Northerners and made sectional conflict worse. 54. Lincoln-Douglas Debates The Lincoln-Douglas debates happened in 1858 during the Illinois Senate race. Abraham Lincoln and Stephen Douglas debated slavery’s expansion. Lincoln argued slavery should not spread, while Douglas supported popular sovereignty. Although Lincoln lost the Senate race, the debates made him nationally known. 55. Popular Sovereignty Popular sovereignty means allowing people in a territory to vote on whether to allow slavery. Stephen Douglas supported this idea. It was used in the Kansas-Nebraska Act. Instead of solving the slavery issue, it led to violence and conflict. 56. Fort Sumter Fort Sumter was a federal fort in South Carolina. Confederate forces fired on it in April 1861. This attack began the Civil War. After Fort Sumter, more Southern states joined the Confederacy. 57. Emancipation Proclamation The Emancipation Proclamation was issued by Abraham Lincoln in 1863. It declared enslaved people free in Confederate-controlled areas. It did not immediately free all enslaved people, but it changed the purpose of the war. The Civil War became a fight to preserve the Union and end slavery. 58. Gettysburg Address The Gettysburg Address was a speech given by Abraham Lincoln in 1863 after the Battle of Gettysburg. Lincoln honored the soldiers who died and explained the meaning of the war. He said the nation was fighting for democracy and equality. The speech is one of the most famous in American history. 59. Reconstruction Reconstruction was the period after the Civil War when the U.S. tried to rebuild the South and reunite the nation. It also aimed to define freedom and rights for formerly enslaved people. During Reconstruction, the 13th, 14th, and 15th Amendments were passed. However, racism, Black Codes, and groups like the Ku Klux Klan limited progress. 60. Civil War Amendments The Civil War Amendments are the 13th, 14th, and 15th Amendments. The 13th Amendment abolished slavery. The 14th Amendment gave citizenship and equal protection under the law. The 15th Amendment gave Black men the right to vote. 61. Roger Williams Roger Williams was a Puritan minister who believed in religious freedom and separation of church and state. He was banished from Massachusetts for his beliefs. He founded Rhode Island, which became known for religious tolerance. His ideas influenced later American ideas about freedom of religion.

Italian and German Surrender in Africa

AI and the Growing Danger of Cognitive surrender

Latin America and Surrounding Territories - NWWH Map Quiz

Theory/Methodology surrounding JVM verification

Introduction: Matter In Our Surroundings

French Vocabulary: Living Locations and Surroundings

WORD - TRANSCRIPTION - DEFINITION - TRANSLATION to bleed - to lose blood, especially because of an injury brim (n) - the part of a hat that sticks out around the edge; криси (капелюха) to set up a line of defense - to organise and prepare a system or group of actions to protect against attack, criticism, or danger; вибудувати / організувати лінію захисту; підготувати оборону liquid asset (n) - an asset that can be easily converted into cash; ліквідний актив stuff (v) - to push or put something into a small space, especially in a quick or careless way; запихати, набивати, засувати (щось у щілину або простір); to be offended (verb phrase) - to feel upset, annoyed, or hurt because of something someone has said or done that you think is rude or insulting; ображатися; бути ображеним to nag (v) - to keep complaining or asking someone to do something, often in an annoying way; пилити; докучати; бурчати; постійно нагадувати/дорікати cello (n) - a large musical instrument in the violin family, played by holding it between the legs while sitting; віолончель disgraceful (adj.) - deserving strong criticism or disapproval because it is very bad or unacceptable; ганебний; соромний; негідний humiliating (adj.) - making someone feel ashamed or stupid and lose their respect for themselves; принизливий; той, що принижує гідність decree (n) - an official order given by a person or authority with power; указ; декрет; постанова hereby (adverb) - (formal) used to say that something is done or agreed in this way; цим; цим самим; цим документом (офіційно) severely (adverb) - in a strict or harsh way; суворо; жорстко go to the gutter (idiom/phrase) - to reside (v.) - to live in a particular place; проживати; мешкати to turn a blind eye (idiom) - cartloads (noun, plural) - the amount of something that fills a cart; віз (вантажу); вози (чогось), повні вози (перен. багато) gentile (noun/adjective) - неєврей; людина неєврейського походження ghetto (n.) - бідний район міста; неблагополучний район to beat up (phrasal verb) - to hit someone hard and repeatedly in order to hurt them; побити; відлупцювати; жорстоко побити; cesspool (n) - a place or situation that is morally very bad or dirty; осередок бруду; моральне болото to keep somebody’s spirits up (idiom/phrase) - conspirator (n) - a person who takes part in a secret plan with other people to do something illegal or harmful; змовник; учасник змови curfew (n) - a rule that says people must stay indoors after a particular time, especially at night; комендантська година incision (n) - надріз; розріз (особливо хірургічний); a cut made in something with a sharp tool, especially during a medical operation to burst (v) - to break open or apart suddenly, or to come out suddenly; anesthetized (verb, past participle, adj.) - to give someone drugs so that they do not feel pain, especially during a medical operation; анестезований; знеболений; під наркозом parasite (n) - (disapproving) a person who lives by taking advantage of others and giving nothing in return; нахлібник; дармоїд; експлуататор apathy (n) - a feeling of not being interested in or enthusiastic about anything, or not caring about what happens; байдужість to get a bite to eat (idiom/phrase) - to have a small meal or snack; перекусити; з’їсти щось швидко (перекус) to declare (v) - to interfere with other people’s business (phrase) to insult (v) - to say or do something that is rude or offensive to someone; ображати; принижувати imperative (adj/noun) - to look on the bright side (idiom/phrase) stinking ( adj.) - having a very bad smell; смердючий; дуже неприємний на запах; slaughter (n) - the killing of animals for food; the killing of many people in a violent way; забій (тварин); різанина; масове вбивство; to lead somebody to their death like sheep (idiom/phrase) - to make people go to their death passively, without resistance, like a group that blindly follows; вести когось на смерть, як овець; гнати на смерть покірно, без спротиву a stain on sth (e.g. on one’s reputation/honour) (idiom/phrase) - something that damages the reputation or image of a person, group, or thing; пляма на (репутації / честі); те, що ганьбить to wipe somebody out (phrasal verb) - знищити; стерти з лиця землі to squander (v) - to waste money, time, or opportunities in a careless or foolish way; марнувати; розтринькувати; розбазарювати; cripple (n) - (offensive) a person who is unable to walk or has a physical disability; як іменник це слово вважається образливим, тому краще використовувати нейтральні варіанти (наприклад, a person with a disability) log (n) - to smother - to prevent a feeling or reaction from being expressed; пригнічувати (почуття, емоції)ж rattle (n) - a series of short, sharp sounds; or a toy that makes a noise when shaken; брязкіт; деренчання; брязкальце to revenge (v) - melting pot (n) - a place or situation in which many different cultures, styles, or people mix together and influence each other; “плавильний котел” (місце змішання культур); багатокультурне середовище the quicker, the better (phrase / comparative structure) - used to say that something should be done as fast as possible; чим швидше, тим краще at ease (phrase / adverbial expression) - (military) in a relaxed position after being told to stop standing at attention; (військ.) «вільно!» (команда) resettlement (n) - the act of helping people to live in a new place, especially after they have been forced to leave their home; переселення; повторне поселення; розселення (після вимушеного переїзду) to exterminate (v) - to kill all the members of a group of people or animals; винищувати; знищувати повністю; to dismiss (v) - to end an official meeting or court case; розпускати (засідання, суд) brimstone (n) - slavery (n) - the system of owning people as property and forcing them to work; рабство rapist (n) - a person who commits rape; ґвалтівник; злочинець, що вчиняє зґвалтування to slash sth/sb - to cut someone or something with a sharp object; or to reduce something greatly; різати; розсікати; сильно скорочувати filthy (adj.) - very dirty; брудний; дуже брудний indiscriminately (adverb) - in a way that does not show careful judgment or choice; без розбору; без розрізнення; не вибірково to draw (the curtains) (v) - to open or close curtains by pulling them across a window; завісити / розсунути штори; зачиняти або відчиняти штори at the heart of the lion’s den (idiom/phrase) - in the most dangerous or hostile place or situation, surrounded by people who are unfriendly or threatening; у самому серці лігва лева; у дуже небезпечному або ворожому середовищі jaundice (n) - a medical condition that causes the skin and the whites of the eyes to become yellow; жовтяниця to jilt (v) - to suddenly end a romantic relationship with someone, especially in an unfair or unkind way; кинути (у стосунках); різко розірвати стосунки; відшити (розм.) to beat the shit out of somebody (very informal / vulgar phrase) - to hit someone very hard and violently; жорстоко побити когось; сильно відлупцювати (розм., вульг.) on your behalf (phrase) - used to mean that someone does something for you or in your place; від твого імені; замість тебе; на твоє прохання inflammation (n, uncountable) - a condition in which a part of your body becomes red, swollen, and painful because of infection or injury; запалення gallbladder (n) - a small organ in the body that stores bile, a liquid that helps digest fat; жовчний міхур levulose (laevulose) (noun, uncountable) - an old name for fructose, a type of sugar found in fruit and honey; фруктоза grenade (n) - a small bomb that is thrown by hand or fired from a gun; граната attic (n) - the space or room at the top of a building directly under the roof; горище; мансарда murderer (noun, plural: murderers) - a person who deliberately kills another person; вбивця; душогуб assassin (n) - a person who kills someone important for political or religious reasons, usually for money or as part of a plan; вбивця (політичний/найманий); найманий кілер; асасин; barbed wire (n, uncount

→ Understand what occurred at the Yalta Conference, including who was present at this meeting -“How do we deal with defeated or liberated countries of Eastern Europe after the war? -Pushed for interim government authority that represents a democracy -USSR would join the war against Japan when Germany is defeated → Claimed they would hold free elections in places freed from Nazi Germany, these free elections did not happen *Memebers present*: FDR (U.S), Churchill (U.K), Stalin (U.S.S.R) → Understand what was discussed at Potsdam, including who was present at this meeting and why that is important. Who is the consistent person at both conferences? → Post-War Germany→ What to do with it? -Confirmed plans to demilitarize Germany and split it into 4 occupied zones -Nuremberg trials tried Nazi’s for war crimes -Potsdam Declaration → Threatened massive attack on Japan unless they surrendered and laid out non-negotiable terms for peace → How did they split Germany? How did they split Berlin? -Split Germany into 4 occupation zones (France, U.S., U.K., U.S.S.R) → Split Berlin into 4 zones, giving the U.S.S.R the majority since Berlin lays in their zone of occupation → Berlin Wall splits Capitalism to the West and Communism to the East Capitalism vs. Communism (Week 10, 4/13: “Capitalism vs. Communism Packet.”) → Understand the fundamental differences between Capitalism and Communism → What major countries are Communist or Capitalist? Communism: USSR, China, North Korea, Vietnam Capitalist: Everyone else (U.S., France, G.B, South Korea) → What is the goal of both economic systems? → Communism: Eliminate social classes, create a classless/moneyless society → Private property is nonexistent, everything is public → Capitalism: Create a free market where individuals have the ability to make their own money and have independence to make their own economic decisions → Private property fuels the capitalist system Arms Race (Week 11, 4/20. “Arms Race PPT Reading”, “Arms Race PPT Dropbox”) → What is an “Arms Race?” Who participated in this “Race?” When two or more countries increase the size of military resources to gain military/political superiority over each other → U.S and U.S.S.R are the countries participating in this Arms Race → Start of the Cold War? → Dropping the nuclear bomb officially started the Arms Race → What type of Arms were being produced by major world powers? Nuclear weapons, ICBMs → How does an Arms Race affect the world/humanity in the world? MAD → If everyone is producing more powerful weapons this puts the world at risk for the possibility of Nuclear War. → If one launches a missile/drops a bomb then the other country retaliates until the world is basically over *The world is at a constant state of fear of the possibility of the unknown and potential end of the war* Space Race (Week 11, 4/22: “Space Race Primary Source Chart”) → What does the “Space Race” imply? Who is racing to space? -Who can get to Space first? The U.S or Soviet Union → Started with the race to space, developed into the race to the moon once the USSR reached space first… U.S reached the moon first → How did the Space Race affect U.S and Soviet Union relations? Greatly intensified Cold War tensions and the constant battle for superiority in any/every way possible for the US and USSR → Led to a greater technological race and a superiority aspect of it for both countries which further increased the need for national defense and funding for specific programs (NASA) Korean War (Week 11, 5/24: “Korean War Webquest”, Week 12, 4/27: “Korean War Textbook Analysis” ) → Who fought in the Korean War? Why was there a conflict in Korea? North Korea, the USSR, and China (communists) vs. South Korea and U.S → Korea used to be under Japanese influence until the end of WWII where it got split up at the 38th parallel by the US and USSR → The war started by the North invading the South and pushing them back to as far south as they could go before the U.S got involved and pushed them back to the 38th parallel and then some → Amercia feared that communism would continue to spread throughout the rest of the Asian continent → What is the legacy of the Korean War today? What is the dividing line between the two Koreas today? North Korea is still communist, South Korea is still capitalist → DMZ (demilitarized zone) at the 38th parallel that is still present today → Nobody won the war, both sides lost? → Forgotten war → Too many casualties → How did the Korean War symbolize the overall theme of the Cold War? This showed how the United States and Soviet Union were at a constant battle with one another and how there is the global struggle between communism and capitalism → Also demonstrated how concerned the United States was with the possible spread of Communism outside of the Soviet Union and how they would do anything to stop the spread Cuban Revolution (Week 12, 4/28: “Cuban Revolution Readings/Guided Questions.”) → Who was the Dictator of Cuba before Castro? Why did he have good relations with the United States? -Castro started to move away from U.S businesses and work more closely with the USSR who supported him. After the Cuban Revolution, the USSR was extremely supportive to Castro and the Cubans → When Castro came to power, how did Cuban relations with the U.S change? How did this change affect the Cuban relationship with the U.S.S.R? -Castro started to move away from U.S businesses and work more closely with the USSR who supported him. After the Cuban Revolution, the USSR was extremely supportive to Castro and the Cubans → Because the U.S openly disliked Castro and were not fans of him due to the change in American business AND the fact that Cuba was turning into a communist nation. → Castro nationalized land and businesses that were owned by the U.S which hurt their economy -Because of the strained relationship with the United States, this strained their relationship and strengthened the relationship between Cuba and the Soviet Union Bay of Pigs (Week 12, 5/1: “Bay of Pigs Packet”) → What was the “Bay of Pigs?” Who initiated this invasion? What was the overall goal of the United States by carrying out this plan? Was it successful? -Bay of Pigs was a failed attempt by the United States to overthrow Fidel Castro -They trained Cuban exiles who opposed Castro’s government to stage an uprising planned by the CIA → Goal was to overthrow Castro and put their own leader in control to benefit U.S business interest *Not successful* Invasion lasted 2 days and this pushed Cuba even closer to the USSR and made Castro look even stronger in Cuba Cuban Missile Crisis (Week 13, 5/4: “Cuban Missile Crisis Primary Source Worksheet”) → What is the “Cuban Missile Crisis?” How did tensions rise so high to almost reach a nuclear war? The U.S had missiles (ICBMs) in Italy and Turkey, close enough to fire at the USSR. The Soviet Union had missiles stationed in newly communist Cuba, 90 miles off the coast of Florida. The threat of a Nuclear War was as close as it ever was because nobody knew when a missile would launch, or who would be the one to launch it. → The U.S put a blockade on Cuba, which to the USSR seemed like an act of war. This increased the tensions between the two countries of who would “blink first” → Where did the U.S have missiles? Where did the U.S.S.R have them? U.S: Italy and Turkey USSR: Cuba Vietnam War (Week 13, 5/8. “Vietnam War Intro Notes”, Week 14, 5/11: “Vietnam War Stations Activity”) → Understand who was fighting on behalf of North and South AND the roles of both fighting parties supporting the North and South Vietnamese, respectively. The United States fought with South Vietnam, sending several million men to fight. The U.S was much more direct in the conflict, providing materials, strategy, men, and other equipment -The USSR did not send as many troops to fight with North Vietnam, but they did provide military aid (weapons), and military/logistical support → Main goal was to spread communism more in Asia → What was the significance of the Gulf of Tonkin AND the Gulf of Tonkin Resolution and how that affected United States involvement in the Vietnam War? The Gulf of Tonkin is in North Vietnam. U.S. destroyers got attacked, allegedly by the North Vietnamese which gave President Johnson the justification to enter the Vietnam War -Gulf of Tonkin Resolution was the response by President Johnson to enter the war without an official declaration of war approved by Congress → This led to the draft of 18-26 year old male citizens → Why was the Tet Offensive significant to the Vietnam War? How did this affect how people in the United States viewed the Vietnam War as a whole? North Vietnamese and Communist “Viet Cong” soldiers attack the South, giving heavy losses to them. Public support is going down significantly in the United States since this was the first televised war, showing the people at home how horrible the truths of war really are and how it is not being won by the U.S like the President is saying → Understand what a PROXY WAR is and the DOMINO THEORY and how it relates to the Cold War relations of the U.S and U.S.S.R. Proxy War is a conflict where a country supports other groups, often people not in the country, to fight a war against a common enemy without directly engaging into the conflict itself → These supported groups (Korea, Vietnam) can recieve military aid, funding, or training → Goal is to exert influence → EXAMPLES: Korea and Vietnam Domino Theory → The theory that if one country falls to communism then a surplus of others will fall to communism. This is a fear of the United States trying to prevent communism from spreading all over the world, putting their global dominance at risk

Matter In Our Surroundings Study Notes

ENV 226: Essential Ecology Final Exam Study Guide — om single-species thinking to the dynamics of many interacting ecies. A community is more even when all species have similar abundances. Diversity: A combined measure of richness and evenness. More diverse = more likely to pull multiple different species out of a 'hat'. Shannon Diversity Index (H′): The most common diversity index. Higher H′ = more diverse (high richness AND high evenness). Formula: H′ = –Σ(pᵢ · ln pᵢ), where pᵢ is the proportion of individuals in species i. Worked example If a community has 4 species, each at 25% (p = 0.25), then H′ = –[4 × (0.25 × ln 0.25)] = 1.39. If one species dominates (e.g., 70/10/10/10), evenness drops and H′ falls even though richness is the same. Why diversity matters — ecosystem function & services Ecosystem function: Biological, geochemical, and physical processes that take place within an ecosystem (e.g., productivity, nutrient cycling, decomposition, pollination). Ecosystem services: The benefits humans derive from ecosystems. Four major categories: Provisioning: food, water, timber, fiber Regulating: climate regulation, flood control, water purification Cultural: recreation, spiritual, aesthetic, educational values Supporting: soil formation, nutrient cycling, primary production How diversity affects function — mechanism Complementary resource use (niche complementarity): Different species use slightly different resources (e.g., water at different soil depths, nutrients at different times). A diverse community captures more of the available resources than any single species could, raising total productivity. Diversity–stability theory Compensation: Species respond differently to environmental fluctuations. When one species declines, another can increase and 'compensate,' keeping overall ecosystem function steady. Insurance hypothesis: A diverse community is more likely to contain at least one species with traits that help the ecosystem cope with change. Diversity acts as ecological 'insurance' against disturbance. Rules of community assembly — what determines diversity at a site Three filters act in sequence on the regional species pool to determine which species actually end up in a local community: Term Definition Dispersal Who can physically get there. Controlled by distance from source populations and by dispersal ability. Connects to the 'mass effect' / rescue effect — regional diversity (gamma) can rescue local diversity (alpha). Environmental filtering What species can tolerate the abiotic conditions (climate, soil, water, salinity). Example: Ponderosa pine will not survive in the Sonoran Desert — environmental filtering excludes it. Biotic filtering What species can coexist given interactions with other species (competition, predation, facilitation). Strongest where abiotic conditions are benign, because more species can be there to interact. Intertidal zonation paradigm — how the filters stack In rocky intertidal communities, abiotic stress (desiccation, wave action) sets the UPPER limit of a species' distribution — an environmental filter. Competition and predation set the LOWER limit — biotic filters. Take-home: environmental filtering dominates in stressful zones; biotic filtering dominates in benign zones. What maintains diversity Intermediate Disturbance Hypothesis (IDH): Diversity is highest at intermediate frequencies or intensities of disturbance. Low disturbance lets competitive dominants exclude others; high disturbance eliminates all but the most disturbance-tolerant species. The middle keeps both groups in the community. Positive species interactions (facilitation): When one species makes conditions better for another (e.g., a nurse shrub providing shade and moisture for seedlings underneath). Facilitation tends to INCREASE biodiversity, especially in stressful environments. 1.2 Succession Primary succession: Colonization of a substrate that has NEVER supported life (e.g., bare bedrock, new volcanic rock, glacial retreat). Soil must be built from scratch, typically by pioneers like lichens and mosses. Secondary succession: Recovery after a disturbance that left soil and some biological legacy behind (e.g., a cleared field, most wildfires). Much faster than primary succession because soil and seed bank persist. Pioneer species: The first species to colonize a disturbed or bare area. Typically fast-growing, high-dispersal, stress-tolerant organisms that modify the site so later-successional species can establish. Quiz-style example The Woodbury Fire burned so intensely on the Tonto NF that only bedrock remained. Recolonization of this area is PRIMARY succession — there is no soil or seed bank left to start from. 1.3 Ecological Energetics Energy: The currency of ecosystems. Most ecological energy originates from the sun as electromagnetic radiation and is stored in tissues (biomass). Trophic level: Organisms that share the same function in the food chain and the same nutritional relationship to primary sources of energy. Level 1 = producers; 2 = primary consumers (herbivores); 3 = secondary consumers (carnivores); 4+ = tertiary / apex predators. Autotroph (primary producer): An organism that produces its own food from inorganic sources — typically plants, algae, and some bacteria via photosynthesis. Consumer (heterotroph): An organism that obtains energy by consuming other organisms. Primary consumers eat producers; secondary consumers eat primary consumers; etc. Production: The rate at which new biomass is created by organisms in an ecosystem (units of mass or energy per area per time). Net primary production (NPP): Gross primary production (total photosynthesis) MINUS the energy plants use for their own respiration. NPP is what is actually available to herbivores. Assimilation and production efficiency Energy is lost at every step of the grazing food chain. Two key efficiencies describe where energy goes: Term Definition Assimilation efficiency (Energy assimilated / energy consumed) × 100%. Assimilated = consumed – egested (waste). Herbivores ≈ 20–50% (tough plant material); carnivores ≈ 80% (similar tissue chemistry). Production efficiency (Energy in new biomass / energy assimilated) × 100%. Endotherms (birds, mammals) are LOW (~1–3%) because most energy is burned as heat; ectotherms (insects, reptiles, fish) are HIGH (~10–50%). Worked example (assimilation efficiency) Eats 400 J, excretes 200 J as waste, puts 50 J into growth. Assimilated = 400 – 200 = 200 J. Assimilation efficiency = 200 / 400 = 50%. The 10% rule Roughly 10% of the energy at one trophic level is transferred to the next. The rest is lost to respiration, heat, and waste. This is WHY food chains are short (usually 4–5 links): there simply isn't enough energy left to support another level. 1.4 Food Webs A food web is many, connected food chains — a map of who eats whom across an entire community. In simple diagrams, arrows point from prey to consumer. Complex diagrams use plus/minus signs to show the direction of effect, and dashed lines to show indirect effects. Top-down control: Higher trophic levels (predators) limit the abundance of lower levels. Removing a top predator releases herbivores, which suppress plants. Bottom-up control: Lower trophic levels (nutrients, producers) limit higher levels. Adding nutrients increases plants, which increases herbivores, which increases predators. Trophic cascade: Indirect effects of a predator propagate down the food web. Classic example: wolves reintroduced to Yellowstone → elk browsing decreases → riparian willow and aspen recover → beavers return → stream ecosystems recover. 2. Ecosystems Ecosystem: A community of organisms PLUS their shared environment. Includes biotic components (plants, herbivores, carnivores, detritivores) and abiotic components (climate, soils, nutrients). 2.1 Ecological building blocks Ecological building block: An atom that (1) makes up organisms and (2) is relatively abundant. Key building blocks: C, H, O, N, P (and sometimes S) — collectively CHONP. Not building blocks: Silicon, aluminum, arsenic, tungsten — they may be abundant in the crust or used by some organisms, but are not core structural elements of life. Potassium is important biologically but is NOT a core 'ecological building block' in this course's sense. 2.2 Liebig's Law of the Minimum Growth is dictated not by the total resources available, but by the SCARCEST resource. The 'limiting nutrient' sets the ceiling on production; adding more of a non-limiting nutrient has no effect until the limit is raised. Application — nutrient pollution A coastal system receives 10 g N, 200 g P, 50 g C, and 20 g O per year as pollutants, and you know the system is N-limited. By Liebig's Law, adding MORE nitrogen is what will most change structure and function — even though phosphorus is arriving in larger quantities, it is not the limiting nutrient. 2.3 Eutrophication Eutrophication is the enrichment of an aquatic system with nutrients (especially N and P) from fertilizer runoff, wastewater, or atmospheric deposition. Process: Excess N fuels algal blooms → algae die and sink → microbial decomposition consumes oxygen → a hypoxic 'dead zone' forms → fish and invertebrates die. Once N is drawn down, the system can become P-limited; phosphorus mined for fertilizer keeps the cycle going. The Gulf of Mexico hypoxic zone is the classic example. 2.4 Nutrient cycles (N, C, P) Term Definition Nitrogen cycle N₂ in atmosphere is biologically inert. Nitrogen-fixing bacteria (free-living and in legume root nodules) convert N₂ → ammonium (NH₄⁺). Nitrification converts NH₄⁺ → nitrite → nitrate (NO₃⁻), the form most plants take up. Denitrification returns N₂ to the atmosphere. Humans roughly DOUBLED global N fixation via the Haber-Bosch process → fertilizer → eutrophication. Phosphorus cycle Largely a SEDIMENTARY cycle — no gaseous phase. P weathers from rock → soil → plants → consumers → back to soil → eventually to ocean sediments. Slow turnover at global scales; a critical component of DNA/RNA, phospholipids, bones, and ATP. Carbon cycle See dedicated section below. C moves among atmospheric, terrestrial, oceanic, and fossil pools. Photosynthesis pulls CO₂ out; respiration and combustion return it. 2.5 Ecotones and cross-ecosystem flows Ecotone: A transition zone between two ecosystems, exhibiting gradients in environmental conditions and a related shift in the composition of plant and/or animal communities (e.g., forest–grassland edge, estuary). Two factors determine how a flow of material/energy from one ecosystem affects another: Relative size of the systems — when the amount of something varies across ecosystems, the LARGER system has a bigger impact on the small system (e.g., a stream flowing into a small pond vs. into the ocean). Quality of the resource — rich subsidies (like salmon carcasses bringing ocean nutrients to streams) matter more than dilute ones. 2.6 Ecological state change & resilience Key components of ecosystems: STRUCTURE (what organisms are there and how they interact), FUNCTION (processes of energy and nutrient movement), and REGIME (which of several possible stable states the system is in). Alternative stable states: An ecosystem can exist in two or more contrasting conditions under the same environmental conditions (e.g., clear lake vs. turbid lake; forest vs. shrubland). Ecological state change (regime shift): A large, persistent, often abrupt shift in the structure and function of an ecosystem, triggered by crossing a critical threshold. Threshold / tipping point: The level of a driver (stressor) at which a system flips to a new state. Hysteresis: Once a system flips, simply reversing the driver does NOT restore the original state — the return path is different from the 'forward' path. Slow vs. fast drivers: Slow drivers (e.g., gradual warming, soil nutrient accumulation) build up until a fast driver (e.g., fire, storm) tips the system across the threshold. Perturbation: Any event (abiotic or biotic) that disturbs the ecosystem. Perturbations that cause regime change can be abiotic (fire, flood, drought) or biotic (pest outbreak, invasion). Resilience: The capacity of a system to absorb disturbance, adapt to change, and recover from adversity while maintaining its essential functions, structure, and identity. The ball-and-cup diagram Picture a ball sitting in a valley (cup) on a hilly landscape. The ball is the current state of the ecosystem; the cup is the 'basin of attraction' for that state. A disturbance pushes the ball; stabilizing (negative) feedback loops pull it back. Strong disturbance or a shrinking cup (loss of resilience) can push the ball over a hill into a NEW cup — that's state change. Negative (stabilizing) feedback loop: A change triggers a response that DAMPENS the change, keeping the system near its current state. Deepens the cup. Positive (amplifying) feedback loop: A change triggers a response that AMPLIFIES the change, pushing the system further from its current state. Flattens the cup and makes state change more likely. Applying resilience to conservation & restoration Manage for resistance — remove stressors that push the ball (exclude high-intensity grazing, reduce pollution). Manage for resilience — rebuild the 'cup' by re-establishing key species, nutrient cycling, and stabilizing feedbacks (planting perennial grasses, restoring hydrology). Passive restoration works when the seed bank, soil, and key species are still intact; active restoration is needed when the system has already crossed the threshold. 3. Landscape Ecology and Biogeography 3.1 Landscape ecology Landscape ecology: The study of spatial patterns of ecosystems and their ecological consequences — explicitly considers the arrangement of habitats across space and how organisms and materials move through them. Spatial elements Term Definition Patch A relatively homogeneous area that differs from its surroundings (e.g., a forest stand in a grassland). Generally the highest-quality habitat. Matrix The background land-cover type that surrounds patches (e.g., desert in Saguaro NP, or agricultural land around forest fragments). Corridor A linear feature connecting patches — allows movement of organisms, genes, and energy. Examples: riparian strips, hedgerows, engineered wildlife crossings (Oracle Road, Tucson). Ecotone See above — the transition zone between landscape elements. Spatial heterogeneity Variability in environmental conditions and habitat types across a landscape. Drives diversity at landscape scales. Scale dependence Ecological patterns and processes depend on the spatial/temporal scale at which they are observed (e.g., a species may look stable regionally but be declining locally). Fragmentation Fragmentation breaks a large continuous habitat into smaller, more isolated patches. Effects include: Loss of total habitat area More edge relative to interior — edge effects (different microclimate, invasives, more predators) penetrate into remaining patches Reduced connectivity — animals cannot move between patches Smaller populations in each patch → inbreeding depression, loss of genetic variability, higher extinction risk Saguaro NP example Mid-sized carnivores in Saguaro NP West crashed after a disease outbreak and never recovered. Why? The city of Tucson grew between Saguaro NP East and West, severing connectivity. No recolonization could occur from the eastern population. Solution: re-establish connectivity — the Oracle Road wildlife crossings documented over 4,400 crossings by 16 species in their first two years. Patch dynamics Patch size, shape, and connectivity change over time because of ecological processes — succession, disturbance (fire, flood, windthrow), and fragmentation — not random chance and not just geology. 3.2 Biomes and realms Biome: A large biological community defined by climate and dominant vegetation type (e.g., tropical rainforest, boreal forest, tundra, desert, savanna, temperate grassland). Biogeographic realm: A large area of the Earth's surface with a distinctive assemblage of taxa, reflecting shared evolutionary history (e.g., Nearctic, Neotropical, Palearctic, Afrotropical, Indomalayan, Australasian, Oceanic, Antarctic). Factors shaping where biomes are found: temperature and precipitation (the primary controls), seasonality, latitude, elevation, continental geography, and evolutionary history. Realms reflect plate tectonics — Pangaea split into Laurasia and Gondwana, then into the continents we have today, producing unique evolutionary trajectories in each realm (e.g., Australia's marsupials, Madagascar's lemurs). 3.3 Island Biogeography and the SLOSS debate MacArthur & Wilson's Theory of Island Biogeography: species richness on an island is set by the balance between the colonization rate (immigration) and the extinction rate. Size effect — larger islands have LOWER extinction rates (bigger populations). Distance effect — islands closer to the mainland have HIGHER colonization rates. Equilibrium species number occurs where colonization and extinction curves INTERSECT. SLOSS debate — Single Large Or Several Small? Originally framed: is a single large reserve or several small reserves of equal total area better for biodiversity? Large favors: lower extinction, room for interior species, bigger populations, full food webs. Several small favors: replication (insurance against one disaster), sampling more habitat types, potentially higher total diversity. Modern answer: it depends — on species' dispersal, the matrix, and whether you value diversity vs. viability. Connectivity (corridors) often matters more than the large/small question alone. Source population: Produces more offspring than can be supported locally — exports individuals to other patches. Population growth rate > 0. Sink population: Organisms arrive but do not reproduce enough to sustain the local population; persists only via immigration from sources. Population growth rate < 0. 4. Extinction and Climate 4.1 The 'Big Five' mass extinctions Term Definition Ordovician–Silurian (~439 Mya) ~85% marine species lost. Cause: rapid glaciation and sea-level drop, then warming. Late Devonian (~364 Mya) Prolonged event; major loss of marine invertebrates, especially reef builders. Probable causes include ocean anoxia and climate change. Permian–Triassic (~251 Mya) 'The Great Dying' — ~96% marine species and ~70% terrestrial vertebrates. THE most severe. Cause: Siberian Traps volcanism → CO₂ spike → warming, ocean acidification, and anoxia. Recovery took 5–10 million years. End Triassic (~199–214 Mya) ~50% of species lost; cleared the way for dinosaurs to dominate. Likely cause: CAMP volcanism and climate change. Cretaceous–Tertiary (K-Pg, ~65 Mya) ~76% of species, including non-avian dinosaurs. Cause: Chicxulub asteroid impact (plus Deccan Traps volcanism) → darkened skies, cooling, then warming. Why scientists are concerned now Current extinction rates are 100–1000× background rates — comparable to mass-extinction levels. Rate of change: current climate change is occurring more rapidly than almost any past episode — faster than many species can adapt or track. Humans have built roads, cities, and agricultural landscapes that BLOCK the range shifts species would otherwise use to follow their climate. Human societies are themselves adapted to current climate (agriculture, supply chains, coastlines) — disruption drives conflict. 4.2 Why climate change affects ecological systems Temperature, precipitation, seasonality, and extreme events all drive the distribution and performance of every species. Shifting climate disrupts energy balance, water balance, food availability, and reproduction; changes the timing of seasonal events; and alters disturbance regimes (fire, floods, storms). All of these cascade through communities and ecosystems. 5. Climate Change — Ecology, Climate, and the Carbon Cycle 5.1 The carbon cycle Term Definition Pool (reservoir) A place where carbon is stored and from which it can be released. Measured as a quantity (e.g., gigatons). Flux The amount of carbon exchanged between pools per unit time (gigatons/year). Measures MOVEMENT. Sink A pool that accumulates more carbon than it releases — net REMOVER of carbon from the active cycle. Source A pool that releases more carbon than it accumulates — net ADDER of carbon to the active cycle. Biggest/smallest pools & fluxes Major carbon pools (approximate, gigatons): Deep ocean: ~37,000 GtC — BY FAR the largest pool Fossil pool (oil, gas, coal): ~10,000 GtC — second largest Reactive ocean sediments: ~6,000 GtC Soils: ~2,300 GtC Surface ocean: ~1,000 GtC Atmosphere: ~800 GtC — this is the pool that drives climate Plant biomass: ~550 GtC (the largest LIVING pool) Major fluxes are photosynthesis and respiration (~120 GtC/yr terrestrial; ~90 GtC/yr ocean), which are normally nearly balanced. Fossil-fuel combustion and deforestation are the (smaller but crucial) fluxes currently unbalancing the system. Why atmospheric CO₂ is increasing Humans are burning fossil fuels — moving carbon from a long-term sink (the fossil pool) into the active atmospheric pool faster than natural sinks can remove it. Deforestation and land-use change also shift carbon from plant biomass and soils to the atmosphere. The balanced photosynthesis/respiration fluxes cannot keep up with the ~10 GtC/yr added by human activity. 5.2 Ocean acidification As atmospheric CO₂ rises, more CO₂ dissolves into the ocean. The chemistry: Step 1: The ocean is slightly alkaline; CO₂ is slightly acidic, so CO₂ dissolves into seawater. Step 2: CO₂ + H₂O → H₂CO₃ (carbonic acid). Step 3: H₂CO₃ dissociates → HCO₃⁻ (bicarbonate) + H⁺. Step 4: Some HCO₃⁻ dissociates → CO₃²⁻ (carbonate) + H⁺. Step 5: Bicarbonate and carbonate exist in equilibrium. Net result: more H⁺ ions → lower pH = acidification. Acidification also reduces carbonate availability, making it harder for corals, shellfish, and plankton to build calcium-carbonate skeletons. Warming and the ocean's ability to sequester carbon Warmer water holds LESS dissolved CO₂ (inverse solubility). As oceans warm, their ability to absorb atmospheric CO₂ decreases — a positive feedback loop that further increases atmospheric CO₂ and warming. 5.3 Important climate feedback loops Term Definition Ice-albedo feedback (POSITIVE) Warming melts polar ice → darker ocean/land replaces reflective white ice → lower albedo, more solar energy absorbed → more warming → more melting. Water vapor feedback (POSITIVE) Warming increases evaporation; water vapor is a greenhouse gas → more warming → more evaporation. Permafrost/methane feedback (POSITIVE) Thawing permafrost releases CO₂ and CH₄ long locked in frozen soils → more warming → more thawing. CO₂ fertilization (NEGATIVE, partially) Higher CO₂ can boost plant photosynthesis, pulling more C out of the atmosphere. Partially counteracts warming but is limited by water, nutrients, and heat stress. Ocean solubility feedback (POSITIVE) Warmer oceans hold less CO₂ → more stays in the atmosphere → more warming. Quiz-style example Melting polar ice caps → decreased albedo → further warming = POSITIVE feedback loop (amplifies the original change). 5.4 Factors affecting Earth's surface temperature Three major controls: Energy arriving from the sun (solar radiation) Earth's albedo — how much of that energy is reflected back to space Greenhouse gases in the atmosphere — how much outgoing infrared is trapped Carbon dioxide is the LARGEST driver of current human-caused climate change (sheer volume, long atmospheric lifetime). Methane is more potent per molecule but far less abundant; water vapor amplifies change via feedback but is not itself a primary driver. 6. Climate Change — Ecological and Human Response 6.1 How climate change affects plants and animals Climate change disrupts performance in three main ways: Term Definition Energy balance Plants: respiration rates rise faster than photosynthesis with warming — net carbon gain (and growth) drops. Animals: thermoregulation costs rise; outside the thermal neutral zone, organisms burn more energy just to stay alive. Water balance Warmer temperatures and higher vapor-pressure deficit mean plants LOSE more water per unit of photosynthesis. Animals face greater dehydration risk; aquatic species face altered hydrology. Food acquisition & reproduction Changed phenology, drought, and heat reduce the resources available for growth and reproduction. Fewer seeds, fewer offspring, lower survival. Examples of species already affected Term Definition Pika Small alpine mammal restricted to cold, rocky talus. Warming pushes them to higher elevations — eventually they 'run out of mountain.' Already extirpated from lower-elevation sites in the Great Basin. Tuatara Reptile with temperature-dependent sex determination. Warming skews sex ratios toward males, threatening population persistence. Wolverine Depends on persistent spring snowpack for denning. Declining snowpack reduces suitable reproductive habitat. 6.2 Responses of species: MOVE, ADAPT, or DIE Move: shift range poleward or upslope to track suitable climate (classic response). Range shifts are highly variable across species — depends on dispersal ability, habitat specificity, and whether barriers (cities, roads, water bodies) intervene. Adapt: through plasticity (phenotypic change within a lifetime) or evolutionary change (genetic change across generations). Long-lived species with small populations adapt slowly. Die: local extirpation or global extinction if neither option is available fast enough. 6.3 Phenology Phenology: The timing of recurring biological events — bud burst, flowering, migration, breeding, hibernation. Climate change is advancing many spring phenological events (earlier bloom, earlier migration). Phenological mismatch occurs when interacting species shift their timing differently — e.g., a migratory bird arrives after its caterpillar prey has already peaked. Mismatches cascade through food webs. 6.4 Characteristics of climate-vulnerable species Narrow thermal tolerance (specialists) Poor dispersal ability (can't move to new climate) Long generation time, low reproductive rate (slow to adapt) Small, fragmented populations (low genetic variation, high stochastic risk) Dependence on climate-sensitive habitats (snowpack, sea ice, coral reefs, alpine tundra) Narrow geographic range, especially on islands or mountain tops (nowhere to go) Tightly tied to a specific phenological window or species interaction 6.5 Why current climate change is especially damaging Rate — change is occurring faster than most species can adapt or move Barriers — human land use has fragmented habitat, blocking the range shifts species used during past climate changes Cumulative stressors — climate change interacts with pollution, invasive species, overharvest, and habitat loss Interconnected systems — ecosystems, human agriculture, and global supply chains are all calibrated to current conditions 6.6 Mitigation vs. Adaptation Term Definition Climate MITIGATION Actions that reduce the magnitude of climate change itself — typically by lowering atmospheric greenhouse gases. Examples: switching to renewables, reforestation (sequestering carbon), reducing fossil-fuel use, more efficient buildings and transport. Climate ADAPTATION Actions that help humans and ecosystems COPE with the climate change that is already happening / unavoidable. Examples: creating migration corridors, building climate-resilient ecosystems through forest thinning, adjusting USDA seed zones, changing crop choices, updating hunting/fishing regulations, designing for sea-level rise. Quick quiz check Planting trees to sequester carbon = MITIGATION (reduces atmospheric CO₂). Thinning Southwest forests to make them more fire-resilient = ADAPTATION (copes with changing fire regime). Geoengineering proposals like stratospheric aerosol injection = a controversial form of mitigation (reduces incoming solar energy). Special cases of adaptation Managed (assisted) relocation: Actively moving species to areas outside their current range that are projected to become climatically suitable. Benefits: may be the only option for species that cannot disperse fast enough; can save species from extinction. Risks: recipient communities may experience novel interactions; potential to create invasive species; ethical questions about intervention. Assisted evolution: Human intervention to increase the rate of evolutionary adaptation — e.g., selective breeding for heat tolerance, or hybridization with warm-adapted populations. Benefits: keeps species in place; works for species that cannot move. Risks: may reduce genetic diversity; unintended consequences; can go wrong (outbreeding depression). 6.7 Corridors, climate refugia, and conservation design Climate refugium: A location whose physical or biological features allow species to persist despite regional climate change — e.g., high-elevation cool pockets, deep canyons, shaded slopes, coastal fog zones. Incorporating corridors (to enable range shifts) and refugia (places species can hold on) into reserve design is essential for climate-integrated conservation. A high-elevation forest that remains cool despite regional warming can serve as a seed source for recolonization — that's the textbook example of a refugium supporting resilience. Final thoughts: making an argument about climate-integrated conservation You should be able to give your own opinion on climate-integrated conservation and defend it. A solid answer acknowledges trade-offs: traditional 'protect what is there' approaches may fail under rapid change, but aggressive interventions (managed relocation, assisted evolution) carry real risks. Most conservation scientists argue for a portfolio approach — protect refugia, build corridors, and use active interventions only where the alternative is extinctionl

આપણી આસપાસમાં દ્રવ્ય (Matter In Our Surroundings)

Confederacy (CSA) :: Formed in February 1861 by 11 Southern states after secession; capital was Richmond; fought to protect slavery and states’ rights. Lincoln's First Inaugural Address (1861) :: Lincoln said secession was illegal, promised not to interfere with slavery where it existed, and aimed to preserve the Union peacefully. Border States :: Missouri, Kentucky, Maryland, Delaware; slave states that stayed in the Union and were strategically important. North vs South (1861) :: North had ~22 million people, industry, and factories; South had ~9 million people and relied on agriculture and slavery. Conscription (1862 CSA / 1863 USA) :: First national draft in U.S. history used when volunteer numbers dropped. Substitution :: Allowed wealthy men to pay others to fight in their place during the draft. Habeas Corpus Suspension (1861–1863) :: Lincoln suspended legal protection requiring trial before imprisonment during wartime. Union Blockade (Anaconda Plan) :: Naval blockade of Southern ports (1861–1865) that cut off trade and weakened Confederacy. Industrial Advantage :: North had ~90% of factories and weapons production compared to the South. Railroads :: North had far more railroads (~22,000 miles vs ~9,000), allowing faster troop movement. Revenue Act of 1862 :: First federal income tax used to fund the Civil War. Greenbacks (1862) :: Union paper money not backed by gold; caused moderate inflation. Greybacks :: Confederate money that became nearly worthless due to inflation. Jay Cooke :: Banker who sold large amounts of Union war bonds. Cotton Diplomacy :: Confederate strategy expecting Britain and France to support them due to cotton dependence. Trent Affair (1861) :: U.S. captured Confederate diplomats from a British ship, nearly causing war with Britain. Ironclads (1862) :: Armored warships (USS Monitor vs CSS Virginia) that changed naval warfare. Robert E. Lee :: Commander of Confederate Army of Northern Virginia. Ulysses S. Grant :: Union general who led successful campaigns like Vicksburg and Appomattox. William T. Sherman :: Union general known for “March to the Sea” and total war tactics. Scorched Earth Policy :: Strategy of destroying enemy supplies, railroads, and farmland. Scott’s Anaconda Plan :: Union strategy to blockade South and split it along the Mississippi River. Telegraph :: Communication system that allowed fast military messaging during war. Appomattox Court House (1865) :: Location where Lee surrendered to Grant, ending the Civil War. Enrollment Act of 1863 :: Union draft law allowing substitutions; caused protests in Northern cities. New York Draft Riots (1863) :: Violent protests against the draft; over 100 killed. Emancipation Proclamation (1863) :: Freed enslaved people in Confederate states still in rebellion. Copperheads :: Northern Democrats who opposed the war and wanted peace with the South. Merryman Case (1861) :: Challenged Lincoln’s suspension of habeas corpus. Vallandigham Case (1863) :: Anti-war politician arrested and exiled for criticizing Lincoln. Milligan Case (1866) :: Supreme Court ruled civilians cannot be tried in military courts if civil courts are open. Election of 1864 :: Lincoln (National Union Party) defeated McClellan; voters chose continuation of war. Freedmen’s Bureau (1865) :: Government agency helping freed slaves with food, jobs, and education. 10% Plan (1863) :: Lincoln’s Reconstruction plan allowing Southern states back after 10% loyalty oath. Wade-Davis Bill (1864) :: Radical Republican plan requiring majority loyalty oath; Lincoln vetoed it. 13th Amendment (1865) :: Abolished slavery in the United States. Civil Rights Act of 1866 :: Gave citizenship and equal rights to all born in the U.S. 14th Amendment (1868) :: Guaranteed citizenship and equal protection under the law. 15th Amendment (1870) :: Gave Black men the right to vote. Andrew Johnson :: President after Lincoln; opposed Radical Republicans and favored lenient Reconstruction. Radical Republicans :: Group led by Thaddeus Stevens that wanted strict Reconstruction and Black rights. Military Reconstruction Acts (1867–68) :: Divided South into military districts controlled by Union Army. Tenure of Office Act (1867) :: Required Senate approval to remove cabinet officials. Impeachment of Andrew Johnson (1868) :: First presidential impeachment; he was not removed from office. Black Codes (1865–1866) :: Southern laws restricting freedom and labor of freed African Americans. Sharecropping :: Farming system where workers gave a share of crops for land use, often causing debt. Carpetbaggers :: Northerners who moved South after the war for opportunity. Scalawags :: Southern whites who supported Reconstruction governments. Ku Klux Klan (KKK, 1865) :: White supremacist group using violence and terror against Black Americans. Colfax Massacre (1873) :: Over 100 Black Americans killed during election violence in Louisiana. Mississippi Plan (1875) :: Use of violence and intimidation to regain white Democratic control. Force Acts (1870–71) :: Federal laws used to stop KKK violence and protect Black voters. Jim Crow Laws :: Laws enforcing racial segregation in the South. Civil Rights Act of 1875 :: Banned segregation in public places; later weakened by courts. Election of 1876 :: Disputed election between Hayes and Tilden. Compromise of 1877 :: Hayes becomes president; federal troops leave South, ending Reconstruction. Redeemers :: Southern Democrats who regained control after Reconstruction. Bourbon Democrats :: Conservative Southern Democrats supporting segregation and limited government. Juneteenth (1865) :: June 19, 1865 when enslaved people in Texas learned they were Lincoln's First Inaugural Address (1861) :: Lincoln said secession was illegal, promised not to interfere with slavery where it existed, and aimed to preserve the Union peacefully. Border States :: Missouri, Kentucky, Maryland, Delaware; slave states that stayed in the Union and were strategically important. North vs South (1861) :: North had ~22 million people, industry, and factories; South had ~9 million people and relied on agriculture and slavery. Conscription (1862 CSA / 1863 USA) :: First national draft in U.S. history used when volunteer numbers dropped. Substitution :: Allowed wealthy men to pay others to fight in their place during the draft. Habeas Corpus Suspension (1861–1863) :: Lincoln suspended legal protection requiring trial before imprisonment during wartime. Union Blockade (Anaconda Plan) :: Naval blockade of Southern ports (1861–1865) that cut off trade and weakened Confederacy. Industrial Advantage :: North had ~90% of factories and weapons production compared to the South. Railroads :: North had far more railroads (~22,000 miles vs ~9,000), allowing faster troop movement. Revenue Act of 1862 :: First federal income tax used to fund the Civil War. Greenbacks (1862) :: Union paper money not backed by gold; caused moderate inflation. Greybacks :: Confederate money that became nearly worthless due to inflation. Jay Cooke :: Banker who sold large amounts of Union war bonds. Cotton Diplomacy :: Confederate strategy expecting Britain and France to support them due to cotton dependence. Trent Affair (1861) :: U.S. captured Confederate diplomats from a British ship, nearly causing war with Britain. Ironclads (1862) :: Armored warships (USS Monitor vs CSS Virginia) that changed naval warfare. Robert E. Lee :: Commander of Confederate Army of Northern Virginia. Ulysses S. Grant :: Union general who led successful campaigns like Vicksburg and Appomattox. William T. Sherman :: Union general known for “March to the Sea” and total war tactics. Scorched Earth Policy :: Strategy of destroying enemy supplies, railroads, and farmland. Scott’s Anaconda Plan :: Union strategy to blockade South and split it along the Mississippi River. Telegraph :: Communication system that allowed fast military messaging during war. Appomattox Court House (1865) :: Location where Lee surrendered to Grant, ending the Civil War. Enrollment Act of 1863 :: Union draft law allowing substitutions; caused protests in Northern cities. New York Draft Riots (1863) :: Violent protests against the draft; over 100 killed. Emancipation Proclamation (1863) :: Freed enslaved people in Confederate states still in rebellion. Copperheads :: Northern Democrats who opposed the war and wanted peace with the South. Merryman Case (1861) :: Challenged Lincoln’s suspension of habeas corpus. Vallandigham Case (1863) :: Anti-war politician arrested and exiled for criticizing Lincoln. Milligan Case (1866) :: Supreme Court ruled civilians cannot be tried in military courts if civil courts are open. Election of 1864 :: Lincoln (National Union Party) defeated McClellan; voters chose continuation of war. Freedmen’s Bureau (1865) :: Government agency helping freed slaves with food, jobs, and education. 10% Plan (1863) :: Lincoln’s Reconstruction plan allowing Southern states back after 10% loyalty oath. Wade-Davis Bill (1864) :: Radical Republican plan requiring majority loyalty oath; Lincoln vetoed it. 13th Amendment (1865) :: Abolished slavery in the United States. Civil Rights Act of 1866 :: Gave citizenship and equal rights to all born in the U.S. 14th Amendment (1868) :: Guaranteed citizenship and equal protection under the law. 15th Amendment (1870) :: Gave Black men the right to vote. Andrew Johnson :: President after Lincoln; opposed Radical Republicans and favored lenient Reconstruction. Radical Republicans :: Group led by Thaddeus Stevens that wanted strict Reconstruction and Black rights. Military Reconstruction Acts (1867–68) :: Divided South into military districts controlled by Union Army. Tenure of Office Act (1867) :: Required Senate approval to remove cabinet officials. Impeachment of Andrew Johnson (1868) :: First presidential impeachment; he was not removed from office. Black Codes (1865–1866) :: Southern laws restricting freedom and labor of freed African Americans. Sharecropping :: Farming system where workers gave a share of crops for land use, often causing debt. Carpetbaggers :: Northerners who moved South after the war for opportunity. Scalawags :: Southern whites who supported Reconstruction governments. Ku Klux Klan (KKK, 1865) :: White supremacist group using violence and terror against Black Americans. Colfax Massacre (1873) :: Over 100 Black Americans killed during election violence in Louisiana. Mississippi Plan (1875) :: Use of violence and intimidation to regain white Democratic control. Force Acts (1870–71) :: Federal laws used to stop KKK violence and protect Black voters. Jim Crow Laws :: Laws enforcing racial segregation in the South. Civil Rights Act of 1875 :: Banned segregation in public places; later weakened by courts. Election of 1876 :: Disputed election between Hayes and Tilden. Compromise of 1877 :: Hayes becomes president; federal troops leave South, ending Reconstruction. Redeemers :: Southern Democrats who regained control after Reconstruction. Bourbon Democrats :: Conservative Southern Democrats supporting segregation and limited government. Juneteenth (1865) :: June 19, 1865 when enslaved people in Texas learned they were free