Floods & Droughts

Pie dough test

🦠 MICROBIOLOGY — WEEK 1 STUDY NOTES Microbiology Foundations Assigned reading: 1.1 What Our Ancestors Knew 1.2 A Systematic Approach 1.3 Types of Microorganisms 3.1 Spontaneous Generation 3.2 Foundations of Modern Cell Theor/y 1.1 What Our Ancestors Knew First: What is microbiology? Microbiology = the study of very small organisms and infectious agents. Microorganism / microbe = an organism that is generally too small to see without a microscope. Examples include: * Bacteria * Archaea * Fungi such as yeast and molds * Protozoa * Microscopic algae * Some parasites Viruses are also studied in microbiology, although viruses are acellular, meaning they are not made of cells. Important idea Microbes are NOT automatically bad. Many microbes are harmless or helpful. They: * help produce food * live naturally in and on our bodies * help ecosystems function * can be used to make medicines and other products Only some microbes cause disease. 🍞 Humans Used Microbes Before They Knew Microbes Existed Humans were using microorganisms for thousands of years before microscopes existed. One of the biggest examples is: Fermentation Fermentation = microorganisms change sugars/carbohydrates into substances such as: * alcohol * gases * organic acids Microbes involved can include: bacteria + yeast + molds Humans used fermentation to make: * bread * cheese * yogurt * beer * wine * pickled vegetables Easy example Yeast eats/metabolizes carbohydrates in bread dough. ↓ Yeast produces carbon dioxide (CO₂). ↓ Gas becomes trapped in the dough. ↓ Bread rises. Remember Fermentation = microbes changing sugars. ⸻ 🧊 Ötzi the Iceman Ötzi was a preserved human mummy approximately 5,300 years old. Scientists found evidence that he had: * Trichuris trichiura → a parasitic worm * Borrelia burgdorferi → bacterium that causes Lyme disease He also carried a fungus called Fomitopsis betulinus, which has laxative and antibiotic properties. Why does this matter? It shows that ancient people were trying to treat disease long before they understood microorganisms. ⸻ 🦠 Early Ideas About Disease Before microscopes, people didn’t know exactly what caused disease. Some cultures believed disease came from: * supernatural forces * angry gods * fate * bad air But some people began to realize that disease might spread between people. ⸻ Quarantine Ancient societies sometimes separated sick people from healthy people. This is called: Quarantine = separating potentially infected people to prevent disease spread. Even though they didn’t know what bacteria or viruses were, they understood that some diseases could spread. ⸻ 🚿 Sanitation Ancient civilizations also developed ways to improve sanitation. Examples included: * clean-water systems * drainage systems * sewers * aqueducts This was important because removing human waste and providing cleaner water can reduce disease transmission. ⸻ Important People From Early Medicine Hippocrates Who? Greek physician. Important idea: Disease had natural causes, rather than always being caused by supernatural forces. He is commonly called: “Father of Western Medicine.” Remember Hippocrates → disease has natural causes. ⸻ Thucydides Thucydides survived the Athenian plague. He noticed that people who survived the disease usually did not become sick from the same disease again while caring for infected people. This was an early observation of: Immunity Immunity = the body’s ability to resist a particular infection/disease. Remember Thucydides → early idea of immunity. ⸻ Marcus Terentius Varro Varro proposed that extremely tiny creatures that could not be seen might cause disease. He described tiny creatures entering the body through the: * mouth * nose This was an important idea because microscopes did not yet exist. Remember Varro → invisible tiny creatures may cause disease. ⸻ Ibn Sina / Avicenna Ibn Sina wrote the important medical work: Canon of Medicine He described ideas involving: * contagion * spread of disease * transmission through breath * isolation of sick people His work contributed to ideas that later became important for quarantine and infectious-disease control. ⸻ 🔬 Birth of Microbiology The development of the microscope completely changed science. For the first time, scientists could actually see microorganisms. ⸻ Antonie van Leeuwenhoek Extremely important name. In 1675, Antonie van Leeuwenhoek used powerful simple microscopes to observe tiny organisms. He called them: “animalcules” Today we know that some of the organisms he observed were: * bacteria * protists Remember Leeuwenhoek → first to describe bacteria/microorganisms seen through a microscope. Think: Leeuwenhoek = LOOKED at microbes. ⸻ ⭐ Golden Age of Microbiology Approximately: 1857–1914 During this period, scientists made major discoveries connecting microorganisms with: * fermentation * disease * medicine * infection Two huge names: Louis Pasteur and Robert Koch You are going to see both names repeatedly in microbiology. ⸻ Louis Pasteur Pasteur showed that microorganisms are responsible for fermentation. He also developed: Pasteurization Pasteurization = using controlled heat to kill/reduce microorganisms that cause spoilage or disease. He also worked on vaccines, including a vaccine against: rabies Pasteur will become especially important again in Section 3.1. Remember Pasteur → fermentation → pasteurization → vaccines → helped prove germ theory → disproved spontaneous generation ⸻ Robert Koch Koch showed that particular microbes could cause particular diseases. He identified microorganisms associated with diseases including: * anthrax * tuberculosis * cholera Remember Koch → specific microbe → specific disease. ⸻ 🧪 Basic Microbiology Laboratory Tools You don’t need to master these yet, but recognize the terms. Microscope → magnifies microbes. Stains/dyes → add color/contrast so microorganisms are easier to see. Growth media → nutrients/material used to grow microorganisms in the laboratory. Petri dish → shallow dish commonly used to hold growth media. Test tube → can contain liquid or solid/semi-solid growth media. Bunsen burner → flame that can be used during laboratory sterilization procedures. These will make much more sense once you start doing microbiology lab work. ⸻ 1.2 A Systematic Approach Now we move from discovering microbes to: “How do scientists organize and name all these different organisms?” ⸻ Taxonomy Definition Taxonomy = classification, description, identification, and naming of living organisms. Think: Taxonomy = biological organization system. ⸻ Carolus Linnaeus Linnaeus developed an important system for classifying organisms. The main levels used in classification include: Kingdom → Phylum → Class → Order → Family → Genus → Species A common memory trick: K P C O F G S King Philip Came Over For Good Soup You should know the order. ⸻ Species Species is the most specific/basic taxonomic level in this hierarchy. Example: Homo sapiens Homo = genus sapiens = species ⸻ Binomial Nomenclature Very important term. Binomial = two names. Every organism receives a scientific name consisting of: Genus + species Example: Homo sapiens Rules: Genus * first letter CAPITALIZED species * lowercase Both should normally be italicized when typed. Correct: Homo sapiens Not: Homo Sapiens ❌ homo sapiens ❌ Homo Sapiens ❌ ⸻ 🌳 Phylogeny Phylogeny = evolutionary relationship/history between organisms. Scientists can represent these relationships with a: Phylogenetic tree A phylogenetic tree shows how organisms are believed to be evolutionarily related. Organisms with a more recent common ancestor are considered more closely related. ⸻ Classification Changed Over Time Scientific classification did not stay the same. Linnaeus Originally divided nature into kingdoms including: * animals * plants * minerals The mineral kingdom was later abandoned. ⸻ Ernst Haeckel Added: Protista for many unicellular organisms. He later proposed Monera for organisms lacking nuclei. Remember: Haeckel → Protista ⸻ Robert Whittaker Developed a five-kingdom system: Animalia Plantae Fungi Protista Monera ⸻ 🧬 Carl Woese — VERY IMPORTANT Carl Woese used differences in: ribosomal RNA (rRNA) to study evolutionary relationships. His work helped establish the modern: THREE-DOMAIN SYSTEM 🟠 Bacteria 🟣 Archaea 🔵 Eukarya This is very important for your Week 1 material. Memorize: BAE Bacteria Archaea Eukarya ⸻ Bergey’s Manuals These are important references used in bacteriology. They help scientists: * classify bacteria * identify bacteria You probably don’t need every detail yet, but recognize the name: Bergey’s Manual ⸻ How Can Bacteria Be Identified? Scientists can identify microorganisms using things such as: Biochemical tests Look at chemical/metabolic characteristics. DNA/RNA analysis Examines genetic material. Serological tests Use reactions involving antibodies/antigens. ⸻ 1.3 Types of Microorganisms This section is VERY IMPORTANT. You need to understand the major groups. ⸻ 🌎 Three Domains of Life Again: 1. Bacteria 2. Archaea 3. Eukarya ⸻ Before We Continue: Two Big Cell Types You will hear these words constantly: PROKARYOTE vs EUKARYOTE Prokaryotic cells DO NOT have a membrane-bound nucleus. Bacteria = prokaryotic Archaea = prokaryotic Eukaryotic cells DO have a membrane-bound nucleus. Examples include: * animals * plants * fungi * protozoa * algae Super important: Prokaryote = NO nucleus Eukaryote = HAS nucleus ⸻ 🦠 BACTERIA Bacteria are: * unicellular * prokaryotic * found almost everywhere Some bacteria are helpful. Some bacteria can cause disease. Many bacteria have cell walls. You’ll learn much more about bacterial structures later. ⸻ 🌋 ARCHAEA Archaea are also: * unicellular * prokaryotic Like bacteria, they do not have a nucleus. BUT: Archaea ≠ Bacteria They differ in: * genetics * evolutionary history * metabolic pathways * cell membrane composition * cell wall composition Archaea occur in many environments. Important textbook point No archaea have been identified as human pathogens. Remember Bacteria + Archaea = Prokaryotes ⸻ 🔵 EUKARYA Eukaryotic microorganisms include: Algae Protozoa Fungi Helminths These have eukaryotic cells. ⸻ 🌿 ALGAE Algae can be: * unicellular * multicellular They are similar to plants in an important way: They perform photosynthesis. Photosynthesis = using light energy to make chemical energy/food. Remember: Algae → photosynthesis. ⸻ 🧫 PROTOZOA Protozoa are: * unicellular * eukaryotic * structurally more complex than bacteria Many are capable of movement. Remember Protozoa → single-celled eukaryotes, often motile. Motile = able to move. ⸻ 🍄 FUNGI Fungi studied in microbiology include: Yeasts Usually unicellular. Molds Usually grow as multicellular filament-like structures. Examples of fungi can be microscopic even though other fungi, such as mushrooms, are large. Remember Fungi → yeast + molds ⸻ 🪱 HELMINTHS Helminths = parasitic worms. You may think: “A worm isn’t microscopic. Why is it in microbiology?” Good question. Adult worms may be large enough to see. BUT their: * eggs * larvae can be microscopic. Therefore they are studied in microbiology. ⸻ 🦠 VIRUSES Viruses are different from cellular organisms. Viruses are ACELLULAR. Acellular = not made of cells. Viruses cannot reproduce independently. They require a: Host cell to reproduce. Remember Virus = acellular + requires host to reproduce ⸻ ⭐ Major Microorganism Comparison Group Cell type Nucleus? Important idea Bacteria Prokaryotic ❌ Some cause disease Archaea Prokaryotic ❌ Different from bacteria; no known human pathogens Fungi Eukaryotic ✅ Yeasts + molds Protozoa Eukaryotic ✅ Unicellular, often motile Algae Eukaryotic ✅ Photosynthesis Helminths Eukaryotic ✅ Parasitic worms Viruses Acellular No cell Need host to reproduce 🔥 This table is worth knowing very well. ⸻ 3.1 Spontaneous Generation This is mainly about one historical question: Where does life come from? People once believed: Spontaneous Generation Spontaneous generation = the belief that living organisms can arise from nonliving material. Examples people once believed: rotting meat → maggots mud → frogs old food → microorganisms Today we know this idea is incorrect. ⸻ Francesco Redi Redi tested whether maggots appeared spontaneously from meat. He compared meat that flies could reach with meat protected from flies. Result Maggots appeared when flies could access the meat. This suggested: Maggots came from flies — not directly from the meat. Remember Redi → meat + flies + maggots ⸻ John Needham Needham performed experiments with broth. He boiled broth and then observed microbial growth afterward. He interpreted this as evidence supporting: Spontaneous generation. Remember Needham → supported spontaneous generation. ⸻ Lazzaro Spallanzani Spallanzani disagreed. He boiled broth for longer and sealed the containers more carefully. The sealed broth did not show microbial growth. He argued that microbes came from contamination from the environment rather than being generated spontaneously. Remember Spallanzani → argued against spontaneous generation. ⸻ 🦢 Louis Pasteur’s Swan-Neck Flask Experiment This is VERY IMPORTANT. Pasteur used flasks with long curved necks. Why the curved neck? Air could enter the flask. BUT: Dust and microorganisms became trapped in the curved neck. So the broth remained uncontaminated. When microorganisms could reach the broth, microbial growth occurred. Conclusion Microorganisms did NOT spontaneously appear. They came from microorganisms already present in the environment. Pasteur helped establish the principle: “Life comes from life.” Exam memory Pasteur → swan-neck flask → disproved spontaneous generation. ⸻ 3.2 Foundations of Modern Cell Theory Now we move from: “Where do microbes come from?” to: “What is life made of?” Answer: CELLS ⸻ 🧬 Cell Theory The textbook describes the development of the idea that cells are the fundamental units of life. The central ideas are: 1. All living organisms are made of one or more cells. 2. The cell is the fundamental/basic unit of life. 3. Cells arise from pre-existing cells. Think: Life → cells → cells come from cells. ⸻ Robert Hooke In the 1660s, Robert Hooke examined cork with a microscope. He saw tiny compartments and called them: “cells” Remember Hooke → named/described cells. Don’t mix him up with Leeuwenhoek: Hooke → cells Leeuwenhoek → microorganisms ⸻ Matthias Schleiden Schleiden studied plants. He concluded that: Plants are made of cells. Remember: Schleiden → plants ⸻ Theodor Schwann Schwann studied animals. He concluded: Animals are made of cells. Remember: Schwann → animals ⸻ Robert Remak Remak provided evidence that cells form through the division of existing cells. ⸻ Rudolf Virchow Virchow strongly promoted the idea: Cells come from other cells. So: New cells do not spontaneously appear. ⸻ Easy Scientist Memory Hooke → saw/named cells Schleiden → plants Schwann → animals Remak/Virchow → cells come from existing cells ⸻ 🧬 Endosymbiotic Theory This sounds difficult, but the basic idea is simple. Endosymbiotic theory says: Mitochondria and chloroplasts were originally bacteria-like prokaryotic cells. A larger ancestral cell engulfed them. Instead of being destroyed, the cells developed a mutually beneficial relationship. Eventually, the engulfed bacteria evolved into: Mitochondria and Chloroplasts inside eukaryotic cells. ⸻ Evidence for Endosymbiotic Theory Mitochondria and chloroplasts have similarities to bacteria. They have: Their own DNA Their DNA resembles bacterial DNA. Their own ribosomes Their ribosomes resemble bacterial ribosomes. They reproduce through a process similar to binary fission Binary fission is a major way bacteria reproduce. Easy version Mitochondria and chloroplasts act strangely like bacteria because their ancestors were bacteria. ⸻ Lynn Margulis Lynn Margulis helped develop and promote the modern endosymbiotic theory. Remember Margulis → endosymbiotic theory ⸻ 🦠 Miasma Theory vs Germ Theory This distinction is very important. Miasma Theory Old idea: Disease comes from “bad air” associated with rotting material. Think: Bad smell → disease. This theory was eventually replaced. ⸻ Germ Theory Germ theory = many diseases are caused by microorganisms. Think: Microbe enters/infects body → disease Scientists whose work helped establish germ theory included: * Ignaz Semmelweis * John Snow * Louis Pasteur * Joseph Lister * Robert Koch ⸻ 🧼 Ignaz Semmelweis Semmelweis worked around childbirth. He noticed that patients treated by doctors and medical students had much higher rates of puerperal fever than patients cared for by midwives. Medical students often went from: autopsies → examining living patients without washing their hands. Semmelweis introduced handwashing with chlorinated lime solution. Result Maternal deaths fell dramatically. Remember Semmelweis → HANDWASHING ⸻ 💧 John Snow John Snow investigated cholera outbreaks in London. He connected cholera cases with: contaminated water. His work helped show that disease wasn’t simply coming from “bad air.” He is important in the history of: Epidemiology Epidemiology = study of disease patterns and spread in populations. Remember Snow → cholera + contaminated water + epidemiology ⸻ Joseph Lister Lister applied ideas about microorganisms to surgery. He promoted: * handwashing * cleanliness * sterilization * antiseptic techniques He used carbolic acid (phenol) to reduce infections during surgery. Result Surgical infections decreased. Remember Lister → antiseptic surgery ⸻ Robert Koch — Again Koch developed: Koch’s postulates These helped scientists determine whether a particular microorganism causes a particular disease. Basic idea: specific microorganism → specific disease You will learn Koch’s postulates in more detail later. ⸻ 🔥 WEEK 1 — PEOPLE YOU NEED TO KNOW Scientist/person Remember THIS Hippocrates Disease has natural causes Thucydides Early observation of immunity Varro Invisible creatures may cause disease Leeuwenhoek Observed microbes/bacteria Linnaeus Taxonomy + naming organisms Haeckel Added Protista Whittaker Five kingdoms Woese Three domains; used rRNA Redi Meat + flies + maggots Needham Supported spontaneous generation Spallanzani Evidence against spontaneous generation Pasteur Swan-neck flask; fermentation; germ theory Hooke Described/named cells Schleiden Plants are made of cells Schwann Animals are made of cells Remak/Virchow Cells come from cells Margulis Endosymbiotic theory Semmelweis Handwashing John Snow Cholera + contaminated water Lister Antiseptic surgery Koch Specific microbes cause specific diseases ⸻ 🚨 THE 15 THINGS I WOULD MEMORIZE FIRST Don’t try to memorize every paragraph tonight. Start here: 1. Microbiology = study of microorganisms. 2. Fermentation uses microbes to convert sugars into products such as alcohol, gases, or acids. 3. Leeuwenhoek observed microorganisms. 4. Pasteur and Koch were major scientists during the Golden Age of Microbiology. 5. Taxonomy = classification and naming of organisms. 6. Binomial nomenclature = Genus + species. 7. Three domains = Bacteria, Archaea, Eukarya. 8. Bacteria + Archaea = prokaryotes. 9. Prokaryote = no membrane-bound nucleus. 10. Eukaryote = has membrane-bound nucleus. 11. Virus = acellular and needs a host to reproduce. 12. Spontaneous generation = life arises from nonliving matter. 13. Pasteur’s swan-neck flask helped disprove spontaneous generation. 14. Cell theory = organisms are made of cells, cells are the basic unit of life, and cells come from existing cells. 15. Germ theory = microorganisms can cause disease. ⸻ 🧠 Super-Simple Week 1 Mental Map Think about the entire week’s reading as one story: PART 1 — Humans discover microbes People used microbes before knowing they existed. ↓ Leeuwenhoek sees them. ↓ Scientists begin studying them. ⸻ PART 2 — Scientists organize microbes Linnaeus → Taxonomy ↓ Woese → 3 domains ↓ Bacteria | Archaea | Eukarya ⸻ PART 3 — Scientists ask where life comes from People believed in spontaneous generation. ↓ Redi + Spallanzani question it. ↓ Pasteur disproves it. ↓ Life comes from existing life. ⸻ PART 4 — Scientists understand cells Hooke → cells ↓ Schleiden → plants Schwann → animals ↓ Remak/Virchow → cells come from cells ↓ Cell Theory ⸻ PART 5 — Scientists understand disease Old: Miasma = bad air causes disease ❌ ↓ New: Germ theory = microorganisms can cause disease ✅ ↓ Semmelweis → handwashing Snow → contaminated water Lister → antiseptic surgery Pasteur → microbes Koch → specific microbe causes specific disease

Drought Stress

Bubba's 33 Pizza Dough Preparation Flashcards

🔹 GIAI ĐOẠN 2 – PHẦN 1 ① TOPIC IELTS: EDUCATION & STUDY A2 → B1 | 1501–1750 A. Hệ thống giáo dục 1501. education – giáo dục 1502. educational – thuộc giáo dục 1503. system – hệ thống 1504. level – cấp độ 1505. primary school – tiểu học 1506. secondary school – trung học 1507. high school – cấp 3 1508. university – đại học 1509. college – cao đẳng 1510. campus – khuôn viên trường 1511. public school – trường công 1512. private school – trường tư 1513. boarding school – trường nội trú B. Học tập – quá trình 1514. study – học 1515. learning – việc học 1516. self-study – tự học 1517. revise – ôn tập 1518. review – xem lại 1519. prepare for – chuẩn bị cho 1520. concentrate – tập trung 1521. focus on – tập trung vào 1522. improve – cải thiện 1523. develop – phát triển 1524. progress – tiến bộ 1525. effort – nỗ lực 1526. goal – mục tiêu C. Môn học – nội dung 1527. subject – môn học 1528. course – khóa học 1529. major – chuyên ngành 1530. lesson – bài học 1531. topic – chủ đề 1532. skill – kỹ năng 1533. knowledge – kiến thức 1534. theory – lý thuyết 1535. practice – thực hành 1536. homework – bài tập về nhà 1537. assignment – bài tập lớn 1538. project – dự án D. Thi cử – đánh giá 1539. exam – kỳ thi 1540. test – bài kiểm tra 1541. assessment – đánh giá 1542. mark – điểm 1543. score – điểm số 1544. grade – xếp loại 1545. result – kết quả 1546. pass – đỗ 1547. fail – trượt 1548. achievement – thành tích 1549. certificate – chứng chỉ 1550. qualification – bằng cấp E. Giáo viên – học sinh 1551. teacher – giáo viên 1552. lecturer – giảng viên 1553. instructor – người hướng dẫn 1554. student – sinh viên 1555. pupil – học sinh 1556. classmate – bạn cùng lớp 1557. learner – người học 1558. graduate – sinh viên tốt nghiệp 1559. freshman – sinh viên năm nhất 1560. senior – sinh viên năm cuối F. Phương pháp học 1561. method – phương pháp 1562. approach – cách tiếp cận 1563. strategy – chiến lược 1564. technique – kỹ thuật 1565. online learning – học trực tuyến 1566. distance learning – học từ xa 1567. group work – làm việc nhóm 1568. discussion – thảo luận 1569. presentation – thuyết trình 1570. research – nghiên cứu G. Môi trường học 1571. classroom – lớp học 1572. library – thư viện 1573. laboratory – phòng thí nghiệm 1574. equipment – thiết bị 1575. facility – cơ sở vật chất 1576. resource – tài nguyên 1577. textbook – sách giáo khoa 1578. material – tài liệu 1579. schedule – thời khóa biểu 1580. timetable – lịch học H. Ý kiến – IELTS hay dùng 1581. opinion – ý kiến 1582. view – quan điểm 1583. idea – ý tưởng 1584. point of view – góc nhìn 1585. advantage – lợi ích 1586. disadvantage – bất lợi 1587. benefit – lợi ích 1588. drawback – hạn chế 1589. importance – tầm quan trọng 1590. influence – ảnh hưởng I. Cụm từ giáo dục (rất hay ra IELTS) 1591. get an education – được học hành 1592. receive education – nhận giáo dục 1593. gain knowledge – tiếp thu kiến thức 1594. develop skills – phát triển kỹ năng 1595. improve academic performance – cải thiện học tập 1596. take an exam – dự thi 1597. pass an exam – đỗ kỳ thi 1598. fail an exam – trượt kỳ thi 1599. achieve good results – đạt kết quả tốt 1600. prepare for the future – chuẩn bị cho tương lai J. Hoàn tất EDUCATION 1601. lifelong learning – học suốt đời 1602. academic success – thành công học tập 1603. school pressure – áp lực học đường 1604. study abroad – du học 1605. higher education – giáo dục bậc cao 1606. compulsory education – giáo dục bắt buộc 1607. equal access – tiếp cận bình đẳng 1608. educational opportunity – cơ hội học tập 1609. learning environment – môi trường học 1610. quality education – giáo dục chất lượng ② TOPIC IELTS: WORK & CAREER A2 → B1 | 1611–1860 ⸻ A. Công việc – khái niệm chung 1611. work – công việc 1612. job – nghề nghiệp 1613. career – sự nghiệp 1614. occupation – nghề 1615. employment – việc làm 1616. unemployment – thất nghiệp 1617. profession – nghề chuyên môn 1618. position – vị trí 1619. role – vai trò 1620. duty – nhiệm vụ B. Nơi làm việc 1621. workplace – nơi làm việc 1622. office – văn phòng 1623. factory – nhà máy 1624. company – công ty 1625. organization – tổ chức 1626. firm – hãng 1627. department – phòng ban 1628. branch – chi nhánh 1629. headquarters – trụ sở chính 1630. site – địa điểm C. Nhân sự – chức danh 1631. employee – nhân viên 1632. employer – người sử dụng lao động 1633. boss – sếp 1634. manager – quản lý 1635. supervisor – giám sát 1636. colleague – đồng nghiệp 1637. co-worker – đồng nghiệp 1638. staff – nhân viên 1639. worker – công nhân 1640. intern – thực tập sinh D. Tuyển dụng – xin việc 1641. apply for – nộp đơn xin 1642. application – đơn xin việc 1643. CV / resume – sơ yếu lý lịch 1644. interview – phỏng vấn 1645. candidate – ứng viên 1646. qualification – trình độ 1647. experience – kinh nghiệm 1648. skill – kỹ năng 1649. requirement – yêu cầu 1650. opportunity – cơ hội E. Thời gian – hình thức làm việc 1651. full-time – toàn thời gian 1652. part-time – bán thời gian 1653. overtime – làm thêm giờ 1654. shift – ca làm 1655. schedule – lịch làm 1656. flexible hours – giờ linh hoạt 1657. remote work – làm việc từ xa 1658. work from home – làm tại nhà 1659. temporary job – việc tạm thời 1660. permanent job – việc lâu dài F. Lương – phúc lợi 1661. salary – lương tháng 1662. wage – lương theo giờ 1663. income – thu nhập 1664. bonus – thưởng 1665. allowance – phụ cấp 1666. benefit – phúc lợi 1667. pension – lương hưu 1668. insurance – bảo hiểm 1669. tax – thuế 1670. pay rise – tăng lương G. Hoạt động công việc 1671. task – nhiệm vụ 1672. assignment – công việc được giao 1673. responsibility – trách nhiệm 1674. project – dự án 1675. deadline – hạn chót 1676. meeting – cuộc họp 1677. report – báo cáo 1678. presentation – thuyết trình 1679. teamwork – làm việc nhóm 1680. cooperation – hợp tác H. Kỹ năng làm việc (B1 rất hay dùng) 1681. communication skills – kỹ năng giao tiếp 1682. problem-solving skills – kỹ năng giải quyết vấn đề 1683. time management – quản lý thời gian 1684. leadership – khả năng lãnh đạo 1685. creativity – sự sáng tạo 1686. adaptability – khả năng thích nghi 1687. responsibility – tinh thần trách nhiệm 1688. independence – tính độc lập 1689. confidence – sự tự tin 1690. discipline – kỷ luật I. Phát triển sự nghiệp 1691. promotion – thăng chức 1692. training – đào tạo 1693. development – phát triển 1694. career path – lộ trình sự nghiệp 1695. job satisfaction – sự hài lòng công việc 1696. job security – sự ổn định việc làm 1697. work-life balance – cân bằng công việc–cuộc sống 1698. career change – chuyển nghề 1699. resign – nghỉ việc 1700. retire – nghỉ hưu J. Vấn đề công việc 1701. stress – căng thẳng 1702. pressure – áp lực 1703. workload – khối lượng công việc 1704. conflict – xung đột 1705. competition – cạnh tranh 1706. discrimination – phân biệt đối xử 1707. equal opportunity – cơ hội bình đẳng 1708. job loss – mất việc 1709. low pay – lương thấp 1710. long working hours – giờ làm dài K. Ý kiến – IELTS Task 2 hay gặp 1711. in my opinion – theo tôi 1712. from my perspective – theo quan điểm của tôi 1713. a major factor – yếu tố chính 1714. an important role – vai trò quan trọng 1715. play a role in – đóng vai trò trong 1716. lead to – dẫn đến 1717. result in – dẫn đến 1718. be responsible for – chịu trách nhiệm cho 1719. depend on – phụ thuộc vào 1720. contribute to – đóng góp vào L. Cụm từ công việc thông dụng 1721. get a job – có việc 1722. find a job – tìm việc 1723. lose a job – mất việc 1724. change jobs – đổi việc 1725. apply for a job – xin việc 1726. attend an interview – dự phỏng vấn 1727. gain experience – tích lũy kinh nghiệm 1728. improve skills – cải thiện kỹ năng 1729. earn a living – kiếm sống 1730. make a living – kiếm sống M. Hoàn tất WORK & CAREER 1731. career opportunities – cơ hội nghề nghiệp 1732. working conditions – điều kiện làm việc 1733. job market – thị trường lao động 1734. skilled workers – lao động có tay nghề 1735. unskilled workers – lao động phổ thông 1736. job demand – nhu cầu việc làm 1737. job supply – nguồn cung việc làm 1738. economic growth – tăng trưởng kinh tế 1739. labor force – lực lượng lao động 1740. employment rate – tỷ lệ việc làm 1741. workplace safety – an toàn lao động 1742. job training program – chương trình đào tạo nghề 1743. career prospects – triển vọng nghề nghiệp 1744. professional development – phát triển chuyên môn 1745. working environment – môi trường làm việc 1746. job performance – hiệu suất công việc 1747. take responsibility – chịu trách nhiệm 1748. work efficiently – làm việc hiệu quả 1749. achieve success – đạt thành công 1750. long-term career – sự nghiệp lâu dài ③ TOPIC IELTS: HEALTH & LIFESTYLE A2 → B1 | 1751–2000 ⸻ A. Sức khỏe chung 1751. health – sức khỏe 1752. healthy – khỏe mạnh 1753. unhealthy – không lành mạnh 1754. fitness – thể lực 1755. illness – bệnh tật 1756. disease – bệnh 1757. condition – tình trạng sức khỏe 1758. medical – thuộc y tế 1759. physical – thể chất 1760. mental – tinh thần B. Cơ thể – cảm giác 1761. pain – cơn đau 1762. headache – đau đầu 1763. stomachache – đau bụng 1764. fever – sốt 1765. cough – ho 1766. cold – cảm lạnh 1767. flu – cúm 1768. injury – chấn thương 1769. tired – mệt 1770. exhausted – kiệt sức C. Điều trị – y tế 1771. doctor – bác sĩ 1772. nurse – y tá 1773. patient – bệnh nhân 1774. hospital – bệnh viện 1775. clinic – phòng khám 1776. treatment – điều trị 1777. medicine – thuốc 1778. pill – viên thuốc 1779. prescription – đơn thuốc 1780. recovery – hồi phục D. Lối sống lành mạnh 1781. lifestyle – lối sống 1782. balance – cân bằng 1783. routine – thói quen 1784. habit – thói quen 1785. healthy diet – chế độ ăn lành mạnh 1786. nutrition – dinh dưỡng 1787. exercise – tập thể dục 1788. workout – buổi tập 1789. rest – nghỉ ngơi 1790. sleep – giấc ngủ E. Ăn uống 1791. meal – bữa ăn 1792. breakfast – bữa sáng 1793. lunch – bữa trưa 1794. dinner – bữa tối 1795. snack – đồ ăn vặt 1796. vegetable – rau 1797. fruit – trái cây 1798. protein – chất đạm 1799. sugar – đường 1800. fat – chất béo F. Hoạt động thể chất 1801. sport – thể thao 1802. activity – hoạt động 1803. run – chạy 1804. walk – đi bộ 1805. swim – bơi 1806. cycle – đạp xe 1807. gym – phòng tập 1808. yoga – yoga 1809. stretch – giãn cơ 1810. strength – sức mạnh G. Vấn đề sức khỏe hiện đại 1811. stress – căng thẳng 1812. pressure – áp lực 1813. anxiety – lo âu 1814. depression – trầm cảm 1815. obesity – béo phì 1816. addiction – nghiện 1817. smoking – hút thuốc 1818. alcohol – rượu 1819. junk food – đồ ăn nhanh 1820. lack of exercise – thiếu vận động H. Phòng ngừa 1821. prevent – phòng ngừa 1822. prevention – sự phòng tránh 1823. avoid – tránh 1824. protect – bảo vệ 1825. check-up – khám tổng quát 1826. vaccine – vắc-xin 1827. hygiene – vệ sinh 1828. wash hands – rửa tay 1829. safety – an toàn 1830. awareness – nhận thức I. Cụm từ IELTS quen thuộc 1831. stay healthy – giữ sức khỏe 1832. keep fit – giữ dáng 1833. be in good shape – thể trạng tốt 1834. suffer from – mắc (bệnh) 1835. recover from – hồi phục sau 1836. lead a healthy life – sống lành mạnh 1837. take care of – chăm sóc 1838. be good for – tốt cho 1839. be harmful to – có hại cho 1840. improve health – cải thiện sức khỏe J. Ý kiến – Task 2 1841. a healthy lifestyle – lối sống lành mạnh 1842. modern life – cuộc sống hiện đại 1843. a common problem – vấn đề phổ biến 1844. play an important role – đóng vai trò quan trọng 1845. have a positive effect – có tác động tích cực 1846. have a negative impact – có tác động tiêu cực 1847. raise awareness – nâng cao nhận thức 1848. take action – hành động 1849. deal with stress – đối phó căng thẳng 1850. improve quality of life – cải thiện chất lượng sống K. Hoàn tất HEALTH & LIFESTYLE 1851. physical health – sức khỏe thể chất 1852. mental health – sức khỏe tinh thần 1853. balanced diet – chế độ ăn cân bằng 1854. regular exercise – tập đều đặn 1855. healthy habits – thói quen tốt 1856. medical care – chăm sóc y tế 1857. long-term health – sức khỏe lâu dài 1858. daily routine – sinh hoạt hằng ngày 1859. personal well-being – hạnh phúc cá nhân 1860. live longer – sống lâu hơn ④ TOPIC IELTS: ENVIRONMENT A2 → B1 | 2001–2250 ⸻ A. Môi trường chung 2001. environment – môi trường 2002. nature – thiên nhiên 2003. natural – tự nhiên 2004. planet – hành tinh 2005. earth – Trái Đất 2006. climate – khí hậu 2007. weather – thời tiết 2008. ecosystem – hệ sinh thái 2009. resource – tài nguyên 2010. natural resources – tài nguyên thiên nhiên B. Ô nhiễm 2011. pollution – ô nhiễm 2012. air pollution – ô nhiễm không khí 2013. water pollution – ô nhiễm nước 2014. noise pollution – ô nhiễm tiếng ồn 2015. waste – rác thải 2016. litter – rác vứt bừa bãi 2017. garbage – rác 2018. plastic – nhựa 2019. chemical – hóa chất 2020. toxic – độc hại C. Biến đổi khí hậu 2021. climate change – biến đổi khí hậu 2022. global warming – nóng lên toàn cầu 2023. greenhouse effect – hiệu ứng nhà kính 2024. carbon dioxide – khí CO₂ 2025. emission – khí thải 2026. temperature – nhiệt độ 2027. rise – tăng lên 2028. extreme weather – thời tiết cực đoan 2029. drought – hạn hán 2030. flood – lũ lụt D. Bảo vệ môi trường 2031. protect – bảo vệ 2032. protection – sự bảo vệ 2033. conserve – bảo tồn 2034. conservation – sự bảo tồn 2035. preserve – gìn giữ 2036. reduce – giảm 2037. reuse – tái sử dụng 2038. recycle – tái chế 2039. waste management – quản lý rác 2040. environmental protection – bảo vệ môi trường E. Năng lượng 2041. energy – năng lượng 2042. power – điện 2043. electricity – điện năng 2044. fossil fuels – nhiên liệu hóa thạch 2045. coal – than đá 2046. oil – dầu mỏ 2047. gas – khí đốt 2048. renewable energy – năng lượng tái tạo 2049. solar energy – năng lượng mặt trời 2050. wind energy – năng lượng gió F. Thiên nhiên & động vật 2051. wildlife – động vật hoang dã 2052. animal – động vật 2053. plant – thực vật 2054. forest – rừng 2055. tree – cây 2056. ocean – đại dương 2057. river – sông 2058. mountain – núi 2059. species – loài 2060. endangered – có nguy cơ tuyệt chủng G. Vấn đề môi trường 2061. deforestation – phá rừng 2062. extinction – tuyệt chủng 2063. overpopulation – quá dân số 2064. urbanization – đô thị hóa 2065. industrialization – công nghiệp hóa 2066. overuse – lạm dụng 2067. shortage – thiếu hụt 2068. destruction – sự tàn phá 2069. environmental damage – thiệt hại môi trường 2070. loss of biodiversity – mất đa dạng sinh học H. Hành động cá nhân 2071. save energy – tiết kiệm năng lượng 2072. save water – tiết kiệm nước 2073. reduce waste – giảm rác 2074. use public transport – dùng phương tiện công cộng 2075. plant trees – trồng cây 2076. avoid plastic bags – tránh túi nhựa 2077. eco-friendly – thân thiện môi trường 2078. green lifestyle – lối sống xanh 2079. environmental awareness – ý thức môi trường 2080. take responsibility – chịu trách nhiệm I. Chính phủ & xã hội 2081. government – chính phủ 2082. policy – chính sách 2083. law – luật 2084. regulation – quy định 2085. organization – tổ chức 2086. campaign – chiến dịch 2087. public awareness – nhận thức cộng đồng 2088. international cooperation – hợp tác quốc tế 2089. environmental project – dự án môi trường 2090. sustainable development – phát triển bền vững J. Cụm từ dùng trong Writing 2091. protect the environment – bảo vệ môi trường 2092. cause serious problems – gây vấn đề nghiêm trọng 2093. have a bad effect on – ảnh hưởng xấu tới 2094. lead to – dẫn đến 2095. result in – dẫn đến 2096. be responsible for – chịu trách nhiệm 2097. play a key role – đóng vai trò then chốt 2098. find solutions – tìm giải pháp 2099. take immediate action – hành động ngay 2100. ensure a better future – đảm bảo tương lai tốt hơn K. Hoàn tất TOPIC ENVIRONMENT 2101. environmental issue – vấn đề môi trường 2102. serious threat – mối đe dọa nghiêm trọng 2103. long-term impact – tác động lâu dài 2104. sustainable future – tương lai bền vững 2105. balance between humans and nature – cân bằng con người & thiên nhiên 2106. protect natural habitats – bảo vệ môi trường sống tự nhiên 2107. reduce carbon emissions – giảm khí thải carbon 2108. green energy – năng lượng xanh 2109. environmental responsibility – trách nhiệm môi trường 2110. protect the planet – bảo vệ hành tinh ⑤ TOPIC IELTS: TECHNOLOGY & MEDIA A2 → B1 | 2251–2500 ⸻ A. Công nghệ chung 2251. technology – công nghệ 2252. technological – thuộc công nghệ 2253. device – thiết bị 2254. machine – máy móc 2255. equipment – thiết bị 2256. digital – kỹ thuật số 2257. modern – hiện đại 2258. innovation – đổi mới 2259. invention – phát minh 2260. development – sự phát triển B. Thiết bị cá nhân 2261. computer – máy tính 2262. laptop – máy tính xách tay 2263. smartphone – điện thoại thông minh 2264. tablet – máy tính bảng 2265. screen – màn hình 2266. keyboard – bàn phím 2267. mouse – chuột 2268. charger – bộ sạc 2269. battery – pin 2270. headphone – tai nghe C. Internet & mạng xã hội 2271. internet – internet 2272. website – trang web 2273. online – trực tuyến 2274. offline – ngoại tuyến 2275. social media – mạng xã hội 2276. platform – nền tảng 2277. application (app) – ứng dụng 2278. account – tài khoản 2279. password – mật khẩu 2280. data – dữ liệu D. Hoạt động công nghệ 2281. search – tìm kiếm 2282. download – tải xuống 2283. upload – tải lên 2284. install – cài đặt 2285. update – cập nhật 2286. connect – kết nối 2287. share – chia sẻ 2288. save – lưu 2289. delete – xóa 2290. store – lưu trữ E. Truyền thông 2291. media – truyền thông 2292. news – tin tức 2293. newspaper – báo 2294. magazine – tạp chí 2295. television – truyền hình 2296. radio – đài phát thanh 2297. channel – kênh 2298. program – chương trình 2299. advertisement – quảng cáo 2300. report – bản tin F. Lợi ích công nghệ 2301. convenience – sự tiện lợi 2302. efficiency – hiệu quả 2303. save time – tiết kiệm thời gian 2304. easy access – dễ tiếp cận 2305. communication – giao tiếp 2306. information – thông tin 2307. entertainment – giải trí 2308. improve productivity – tăng năng suất 2309. global connection – kết nối toàn cầu 2310. daily life – cuộc sống hằng ngày G. Mặt trái công nghệ 2311. addiction – nghiện 2312. screen time – thời gian dùng màn hình 2313. distraction – sự xao nhãng 2314. privacy – quyền riêng tư 2315. personal data – dữ liệu cá nhân 2316. cybercrime – tội phạm mạng 2317. fake news – tin giả 2318. misinformation – thông tin sai lệch 2319. security risk – rủi ro bảo mật 2320. lack of face-to-face interaction – thiếu giao tiếp trực tiếp H. Giáo dục & công nghệ 2321. online learning – học trực tuyến 2322. e-learning – học điện tử 2323. virtual class – lớp học ảo 2324. digital skills – kỹ năng số 2325. educational platform – nền tảng học tập 2326. distance learning – học từ xa 2327. online course – khóa học online 2328. video lesson – bài học video 2329. access knowledge – tiếp cận tri thức 2330. learning tool – công cụ học tập I. Cụm từ Writing – Speaking 2331. play an important role – đóng vai trò quan trọng 2332. have a strong influence on – ảnh hưởng mạnh tới 2333. make life easier – làm cuộc sống dễ hơn 2334. depend on technology – phụ thuộc công nghệ 2335. keep in touch – giữ liên lạc 2336. spread information – lan truyền thông tin 2337. change the way people live – thay đổi cách sống 2338. improve communication – cải thiện giao tiếp 2339. cause problems – gây vấn đề 2340. bring benefits – mang lại lợi ích J. Hoàn tất TECHNOLOGY & MEDIA 2341. modern technology – công nghệ hiện đại 2342. digital age – thời đại số 2343. technological advancement – tiến bộ công nghệ 2344. mass media – truyền thông đại chúng 2345. online communication – giao tiếp trực tuyến 2346. responsible use – sử dụng có trách nhiệm 2347. control screen time – kiểm soát thời gian màn hình 2348. protect privacy – bảo vệ quyền riêng tư 2349. reliable information – thông tin đáng tin 2350. technology in daily life – công nghệ trong đời sống ⑥ SYNONYMS & PARAPHRASE CORE A2 → B1 | 2501–3000 ⸻ A. Động từ thông dụng → synonym B1 2501. start → begin 2502. end → finish 2503. help → assist 2504. get → obtain 2505. make → create 2506. show → demonstrate 2507. use → utilize 2508. need → require 2509. give → provide 2510. keep → maintain B. Động từ học thuật nhẹ 2511. increase – tăng 2512. decrease – giảm 2513. improve – cải thiện 2514. reduce – giảm bớt 2515. develop – phát triển 2516. affect – ảnh hưởng 2517. support – ủng hộ 2518. allow – cho phép 2519. prevent – ngăn chặn 2520. encourage – khuyến khích C. Tính từ cơ bản → B1 2521. big → large 2522. small → tiny 2523. important → significant 2524. good → positive 2525. bad → negative 2526. easy → simple 2527. hard → difficult 2528. fast → rapid 2529. slow → gradual 2530. useful → beneficial D. Trạng từ thay thế 2531. very → extremely 2532. really → highly 2533. often → frequently 2534. usually → normally 2535. sometimes → occasionally 2536. clearly → obviously 2537. quickly → rapidly 2538. slowly → gradually 2539. almost → nearly 2540. maybe → possibly E. Danh từ học thuật nhẹ 2541. problem – vấn đề 2542. solution – giải pháp 2543. reason – lý do 2544. result – kết quả 2545. effect – tác động 2546. cause – nguyên nhân 2547. benefit – lợi ích 2548. disadvantage – bất lợi 2549. advantage – lợi thế 2550. factor – yếu tố F. Cụm paraphrase cực hay dùng 2551. a lot of → a large amount of 2552. many → numerous 2553. few → a small number of 2554. people → individuals 2555. children → young people 2556. old people → the elderly 2557. nowadays → these days 2558. in the future → in the long term 2559. more and more → an increasing number of 2560. less and less → a decreasing amount of G. Liên kết câu B1 2561. because → due to 2562. because of → owing to 2563. so → therefore 2564. but → however 2565. also → moreover 2566. and → in addition 2567. for example → for instance 2568. in my opinion → from my perspective 2569. first → firstly 2570. finally → eventually H. Writing Task 2 – cụm “ăn điểm” 2571. It is widely believed that – Người ta tin rằng 2572. There is no doubt that – Không nghi ngờ gì rằng 2573. It can be seen that – Có thể thấy rằng 2574. One possible reason is that – Một lý do có thể là 2575. This leads to – Điều này dẫn đến 2576. As a result – Do đó 2577. For this reason – Vì lý do này 2578. In conclusion – Kết luận 2579. To sum up – Tóm lại 2580. In my view – Theo quan điểm của tôi I. Speaking B1 – phản xạ nhanh 2581. I think that – Tôi nghĩ rằng 2582. In my opinion – Theo tôi 2583. From my point of view – Từ góc nhìn của tôi 2584. I agree with – Tôi đồng ý với 2585. I disagree with – Tôi không đồng ý với 2586. It depends on – Tùy thuộc vào 2587. For example – Ví dụ 2588. Such as – Chẳng hạn như 2589. In general – Nhìn chung 2590. In daily life – Trong đời sống hằng ngày J. Collocations B1 bắt buộc 2591. make a decision – đưa ra quyết định 2592. take responsibility – chịu trách nhiệm 2593. have an effect on – ảnh hưởng đến 2594. play an important role – đóng vai trò quan trọng 2595. pay attention to – chú ý đến 2596. take part in – tham gia 2597. deal with – xử lý 2598. lead to – dẫn đến 2599. depend on – phụ thuộc vào 2600. contribute to – đóng góp cho K. Hoàn tất GIAI ĐOẠN 2 2601. basic academic vocabulary 2602. topic-based vocabulary 2603. synonym awareness 2604. paraphrasing skills 2605. reading comprehension 2606. listening accuracy 2607. speaking fluency 2608. writing clarity 2609. B1 readiness 2610. solid foundation ⑦ SYNONYMS & PARAPHRASE THEO TOPIC (2611–2700) A. People / Society 2611. people → individuals – cá nhân 2612. people → the public – công chúng 2613. society – xã hội 2614. community – cộng đồng 2615. population – dân số 2616. citizen – công dân 2617. resident – cư dân 2618. youngster – người trẻ 2619. adult – người trưởng thành 2620. senior – người cao tuổi B. Education 2621. education – giáo dục 2622. schooling – việc đi học 2623. academic – học thuật 2624. subject – môn học 2625. curriculum – chương trình học 2626. lesson – bài học 2627. assignment – bài tập 2628. examination – kỳ thi 2629. qualification – bằng cấp 2630. knowledge – kiến thức C. Work / Career 2631. job – công việc 2632. occupation – nghề nghiệp 2633. career – sự nghiệp 2634. employee – nhân viên 2635. employer – chủ lao động 2636. colleague – đồng nghiệp 2637. workplace – nơi làm việc 2638. salary – lương 2639. income – thu nhập 2640. working conditions – điều kiện làm việc D. Health (paraphrase hay dùng) 2641. healthy – in good health – khỏe mạnh 2642. unhealthy – harmful to health – có hại sức khỏe 2643. illness – health problem – vấn đề sức khỏe 2644. disease – serious illness – bệnh nghiêm trọng 2645. treatment – medical care – điều trị 2646. recovery – return to health – hồi phục 2647. exercise – physical activity – vận động 2648. diet – eating habits – thói quen ăn uống 2649. stress – mental pressure – áp lực tinh thần 2650. lifestyle – way of life – lối sống E. Environment 2651. environment – natural surroundings – môi trường tự nhiên 2652. pollution – environmental damage – ô nhiễm 2653. protect – safeguard – bảo vệ 2654. destroy – damage badly – phá hủy 2655. waste – rubbish – rác 2656. recycle – reuse materials – tái chế 2657. climate – weather conditions – khí hậu 2658. global warming – rising temperatures – nóng lên toàn cầu 2659. energy – power source – năng lượng 2660. resources – natural materials – tài nguyên F. Technology 2661. technology – modern devices – công nghệ 2662. internet – online network – mạng internet 2663. social media – online platforms – mạng xã hội 2664. device – electronic equipment – thiết bị 2665. screen – display – màn hình 2666. information – data – thông tin 2667. communicate – keep in contact – giao tiếp 2668. download – save from internet – tải về 2669. addiction – strong dependence – nghiện 2670. privacy – personal information – quyền riêng tư G. Opinion & Argument 2671. opinion – personal view – quan điểm cá nhân 2672. idea – thought – ý tưởng 2673. agree – share the same view – đồng ý 2674. disagree – hold a different view – không đồng ý 2675. discuss – talk about – thảo luận 2676. explain – make clear – giải thích 2677. support – give reasons for – ủng hộ 2678. oppose – be against – phản đối 2679. point of view – perspective – góc nhìn 2680. conclusion – final opinion – kết luận H. Cause – Effect (B1 bắt buộc) 2681. cause – reason – nguyên nhân 2682. effect – result – kết quả 2683. lead to – cause – dẫn đến 2684. result in – cause – dẫn đến 2685. because of – due to – vì 2686. therefore – as a result – do đó 2687. so – for this reason – vì vậy 2688. consequence – outcome – hệ quả 2689. impact – influence – tác động 2690. affect – influence – ảnh hưởng I. Degree / Quantity 2691. many – a large number of – nhiều 2692. much – a large amount of – nhiều 2693. few – a small number of – ít 2694. little – a small amount of – ít 2695. more – a higher number – nhiều hơn 2696. less – a lower amount – ít hơn 2697. most – the majority – phần lớn 2698. some – a number of – một số 2699. almost all – nearly all – gần như tất cả 2700. none – no one / nothing – không ai / không gì ⑧ Collocations & Paraphrase / Speaking – Writing B1 (2701–3000) ⸻ A. Collocations cơ bản B1 (2701–2750) 2701. make a decision – đưa ra quyết định 2702. take responsibility – chịu trách nhiệm 2703. have an effect on – ảnh hưởng đến 2704. play an important role – đóng vai trò quan trọng 2705. pay attention to – chú ý đến 2706. take part in – tham gia 2707. deal with – xử lý 2708. lead to – dẫn đến 2709. depend on – phụ thuộc vào 2710. contribute to – đóng góp cho 2711. solve a problem – giải quyết vấn đề 2712. improve skills – cải thiện kỹ năng 2713. achieve goals – đạt mục tiêu 2714. face challenges – đối mặt thử thách 2715. overcome difficulties – vượt khó khăn 2716. gain experience – tích lũy kinh nghiệm 2717. provide support – cung cấp hỗ trợ 2718. raise awareness – nâng cao nhận thức 2719. protect the environment – bảo vệ môi trường 2720. conserve energy – tiết kiệm năng lượng 2721. earn money – kiếm tiền 2722. spend time – dành thời gian 2723. reduce stress – giảm căng thẳng 2724. maintain balance – duy trì cân bằng 2725. save money – tiết kiệm tiền 2726. create opportunities – tạo cơ hội 2727. exchange ideas – trao đổi ý tưởng 2728. make progress – tiến bộ 2729. have an impact – có tác động 2730. build relationships – xây dựng mối quan hệ 2731. achieve success – đạt thành công 2732. improve health – cải thiện sức khỏe 2733. enhance knowledge – nâng cao kiến thức 2734. improve quality of life – nâng cao chất lượng sống 2735. protect wildlife – bảo vệ động vật hoang dã 2736. reduce pollution – giảm ô nhiễm 2737. contribute positively – đóng góp tích cực 2738. provide opportunities – cung cấp cơ hội 2739. solve environmental issues – giải quyết vấn đề môi trường 2740. take action – hành động 2741. improve communication – cải thiện giao tiếp 2742. develop creativity – phát triển sáng tạo 2743. strengthen skills – củng cố kỹ năng 2744. gain confidence – tăng sự tự tin 2745. manage time – quản lý thời gian 2746. support learning – hỗ trợ việc học 2747. share knowledge – chia sẻ kiến thức 2748. achieve objectives – đạt mục tiêu 2749. protect natural resources – bảo vệ tài nguyên thiên nhiên 2750. reduce risks – giảm rủi ro ⸻ B. Paraphrase hữu ích Writing B1 (2751–2800) 2751. a lot of → a large number of / a great deal of – nhiều 2752. many → numerous – nhiều 2753. few → a small number of – ít 2754. people → individuals – con người 2755. children → young people – trẻ em 2756. old people → the elderly – người già 2757. nowadays → these days – ngày nay 2758. in the future → in the long term – trong tương lai 2759. more and more → an increasing number of – ngày càng nhiều 2760. less and less → a decreasing amount of – ngày càng ít 2761. is important → plays a vital role – quan trọng 2762. leads to → results in – dẫn đến 2763. causes → brings about – gây ra 2764. helps → contributes to – giúp 2765. improves → enhances – cải thiện 2766. affects → has an impact on – ảnh hưởng 2767. solves → addresses – giải quyết 2768. shows → demonstrates – chỉ ra 2769. suggests → recommends – đề xuất 2770. says → states – nói 2771. I think → In my opinion – tôi nghĩ 2772. I believe → It is believed that – tôi tin rằng 2773. I agree → I share the view that – tôi đồng ý 2774. I disagree → I do not agree – tôi không đồng ý 2775. it is good → it is beneficial – tốt 2776. it is bad → it is harmful – có hại 2777. it is necessary → it is essential – cần thiết 2778. it is possible → it is feasible – khả thi 2779. it is important → it is crucial – quan trọng 2780. it is interesting → it is fascinating – thú vị ⸻ C. Speaking phrases / functional language (2781–2850) 2781. In my opinion – theo tôi 2782. From my point of view – từ góc nhìn của tôi 2783. I think that – tôi nghĩ rằng 2784. I agree with – tôi đồng ý với 2785. I disagree with – tôi không đồng ý với 2786. It depends on – tùy thuộc vào 2787. For example – ví dụ 2788. Such as – chẳng hạn 2789. In general – nhìn chung 2790. In daily life – trong đời sống hàng ngày 2791. On the one hand – một mặt 2792. On the other hand – mặt khác 2793. Firstly / Secondly / Finally – thứ nhất / thứ hai / cuối cùng 2794. As a result – do đó 2795. Therefore – vì vậy 2796. In conclusion – kết luận 2797. To sum up – tóm lại 2798. For this reason – vì lý do này 2799. It can be seen that – có thể thấy rằng 2800. One possible reason is that – một lý do có thể là ⸻ D. Collocations nâng cao / Writing Task 2 (2801–2900) 2801. bring benefits – mang lại lợi ích 2802. cause problems – gây vấn đề 2803. improve quality of life – nâng cao chất lượng cuộc sống 2804. take responsibility – chịu trách nhiệm 2805. play an important role – đóng vai trò quan trọng 2806. raise awareness – nâng cao nhận thức 2807. contribute to society – đóng góp cho xã hội 2808. provide opportunities – cung cấp cơ hội 2809. overcome challenges – vượt qua thử thách 2810. deal with issues – xử lý vấn đề 2811. achieve goals – đạt mục tiêu 2812. maintain balance – duy trì cân bằng 2813. improve skills – cải thiện kỹ năng 2814. strengthen knowledge – củng cố kiến thức 2815. develop abilities – phát triển năng lực 2816. encourage participation – khuyến khích tham gia 2817. support learning – hỗ trợ việc học 2818. protect the environment – bảo vệ môi trường 2819. reduce pollution – giảm ô nhiễm 2820. save energy – tiết kiệm năng lượng 2821. take action – hành động 2822. build relationships – xây dựng mối quan hệ 2823. gain experience – tích lũy kinh nghiệm 2824. create opportunities – tạo cơ hội 2825. enhance communication – cải thiện giao tiếp 2826. manage time effectively – quản lý thời gian hiệu quả 2827. participate actively – tham gia tích cực 2828. exchange ideas – trao đổi ý tưởng 2829. achieve success – đạt thành công 2830. face difficulties – đối mặt khó khăn 2831. deal with stress – xử lý căng thẳng 2832. live a healthy life – sống lành mạnh 2833. develop creativity – phát triển sáng tạo 2834. gain confidence – tăng sự tự tin 2835. improve academic performance – cải thiện kết quả học tập 2836. support teamwork – hỗ trợ làm việc nhóm 2837. reduce risks – giảm rủi ro 2838. encourage innovation – khuyến khích sáng tạo 2839. enhance problem-solving – nâng cao khả năng giải quyết vấn đề 2840. maintain discipline – duy trì kỷ luật 2841. promote education – thúc đẩy giáo dục 2842. protect wildlife – bảo vệ động vật hoang dã 2843. address social issues – giải quyết vấn đề xã hội 2844. promote equality – thúc đẩy bình đẳng 2845. encourage participation – khuyến khích tham gia 2846. reduce inequalities – giảm bất bình đẳng 2847. support sustainable development – hỗ trợ phát triển bền vững 2848. improve public services – cải thiện dịch vụ công 2849. provide healthcare – cung cấp chăm sóc y tế 2850. strengthen communities – củng cố cộng đồng ⸻ E. Tổng hợp final B1 phrases (2851–3000) 2851. it is widely believed that – người ta tin rằng 2852. there is no doubt that – không nghi ngờ gì rằng 2853. it can be seen that – có thể thấy rằng 2854. one possible reason is that – một lý do có thể là 2855. this leads to – điều này dẫn đến 2856. as a result – do đó 2857. for this reason – vì lý do này 2858. in conclusion – kết luận 2859. to sum up – tóm lại 2860. in my view – theo quan điểm của tôi 2861. according to research – theo nghiên cứu 2862. recent studies show that – các nghiên cứu gần đây cho thấy 2863. it is important to note – quan trọng lưu ý rằng 2864. experts suggest that – các chuyên gia đề xuất rằng 2865. it has been proven that – đã được chứng minh rằng 2866. generally speaking – nhìn chung 2867. on average – trung bình 2868. in comparison – so sánh 2869. in contrast – ngược lại 2870. as mentioned above – như đã đề cập 2871. I strongly believe – tôi tin chắc rằng 2872. it is essential to – cần thiết phải 2873. it is crucial to – cực kỳ quan trọng để 2874. it is necessary to – cần phải 2875. one should – người ta nên 2876. people must – mọi người phải 2877. we need to – chúng ta cần 2878. we should – chúng ta nên 2879. it is recommended to – được khuyến nghị làm 2880. it is advisable to – hợp lý làm 2881. for instance – ví dụ 2882. such as – chẳng hạn 2883. particularly – đặc biệt 2884. especially – đặc biệt là 2885. in addition – thêm vào đó 2886. moreover – hơn nữa 2887. furthermore – hơn nữa 2888. however – tuy nhiên 2889. although – mặc dù 2890. despite – mặc dù 2891. due to – bởi vì 2892. because of – vì 2893. as a result – kết quả là 2894. therefore – vì vậy 2895. consequently – do đó 2896. thus – do đó 2897. in order to – để 2898. so that – để mà 2899. with the aim of – với mục tiêu 2900. in the long term – về lâu dài

Literary Analysis: Northern River and Drought Year

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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

Hydrospheric Sciences, Drought Monitoring