Comprehensive Multi-Subject Study Notes

Xylem and Phloem Functions:
- Xylem cells: Transport water from roots to leaves during transpiration.
- Phloem: Transports sugars during translocation.
Electron Microscopes: Provide higher magnification and higher resolution.
Magnification Formula: $\text{Magnification} = \frac{\text{Size of Image}}{\text{Size of real object}}$
Diffusion: The spreading out of particles of any substance in solution or gas, resulting in a net movement from an area of higher concentration to an area of lower concentration.
Exchange Surface Adaptations:
- Small Intestine: Long with villi for a large surface area, thin cell membranes for a short diffusion pathway, a rich blood supply to maintain a steep concentration gradient, and lots of mitochondria.
- Lungs: Lots of alveoli for a large surface area, thin membranes for a short diffusion pathway, and good ventilation and blood supply to maintain a steep concentration gradient.

Gradient ( $m$ ): Represents the steepness of a line (how far it goes up per one square across).
Formulas: $m = \frac{\text{gradient up}}{\text{across}}$ $m = \frac{y_1 - y_2}{x_1 - x_2}$
Example Calculation: For points $(1,5)$ to $(4,15)$ , $m = \frac{15 - 5}{4 - 1} = \frac{10}{3}$ (gradient = $3$ ).
Line Properties:
- Horizontal lines have a gradient of $0$ .
- Vertical lines have an undefined gradient.
- Parallel lines have the same gradient.

Internal Energy: Total energy stored by the particles in a system, combining kinetic energy (how fast) and potential energy (spread out) stores.
Boiling vs. Evaporation:
- Boiling: Occurs at only one temperature, takes place throughout the liquid, and its rate depends on the heat supply rate.
- Evaporation: Occurs at all temperatures, takes place from the surface only, and its rate depends on temperature, surface area, and wind/breeze.
Force in a Gas: Increased by adding more particles or increasing temperature (causes higher kinetic energy and more forceful collisions).

Mixtures: Two or more elements or compounds not chemically bonded together; can be separated by filtration or distillation.
Atomic Models & Discovery Timeline:
- Plum Pudding Model: Positively charged circular model with negatively charged electrons evenly spread out; developed after discovering the electron.
- Alpha Particle Scattering Experiment: Showed atomic mass is concentrated at the center and the nucleus is charged; led to the Nuclear Model.
- Niels Bohr: Adapted the nuclear model by proposing that electrons orbit the nucleus at set distances.
- James Chadwick: Proved the existence of neutrons in the nucleus.
Subatomic Particle Relative Charges:
- Proton: $+1$
- Neutron: $0$
- Electron: $-1$
- Atoms have no overall charge because the number of protons and electrons are equal.

Attributes of God:
- Omnipotent: All-powerful.
- Omniscient: All-knowing (past, present, and future).
- Omnibenevolent: All-good / all-loving.
- Omnipresent: Present everywhere.
- Immanent: Here and now (interacting with the world).
- Transcendent: Beyond the limits of human experience, knowledge, and understanding.
- Merciful: Forgiving and compassionate.
Monotheism: Belief in one God (termed Tawhid in Islam).

1851 Indian Appropriations Act: Allocated money to indigenous people to move to specified areas in Oklahoma and encouraged them to become farmers.
1851 Fort Laramie Treaty: Indigenous people agreed to safe passage for travelers to Oregon and California and allowed building forts along routes in exchange for $\$50,000$ for $50\,\text{years}$ .
1862 Little Crow's War: Little Crow and Dakota Sioux ceded land to move onto a reservation for money and supplies. Reservation agents withheld goods; starving indigenous people attacked the agency in August $1862$ , burning buildings and killing $600$ settlers and soldiers. Indigenous people were subsequently moved to worse lands.
1864 Sand Creek Massacre: Gold discovery in Colorado ( $1858$ ) led Black Kettle and indigenous groups to agree to move, but Dog Soldiers resisted mining on sacred land. Colonel Chivington ordered troops to "kill and destroy" hostile indigenous people; on $29\,\text{November }1864$ , $700$ US troops attacked Black Kettle's camp.

Migration Topics and Statistics:
- Migrants constitute $25\%$ of the British population.
- Global migration is rising; the UK's aging population presents a far greater problem than migration.
- On average, migrants pay more taxes than UK workers and contribute significantly to public services.
- Key points of discussion include claims regarding prison demographics, job market impacts, welfare and health service burdens, housing shortages/prices, wage impacts, and refugee/asylum seeker proportions.

Flowcharts: Visual illustrations showing the sequential order of a process.
- Advantages: Shows clear paths to achieve intended products, highly logical, aids organization, and identifies potential problems.
- Disadvantages: Can become overly complex with too many options, must be redone if changes or mistakes occur, and requires knowledge of components to understand functionality.
Flowchart Components:
- Terminator: Represents the start and end.
- Process: Indicates an action taking place.
- Decision: Shows choices to be made.
- Input / Output: Allows adding or removing data.
- Arrow: Displays direction of flow.