Concise Notes: Life, Organization, Hypothesis, and Experimental Design

1) Order: Living systems have complex structural organization.
2) Response to Stimuli: React to environmental changes.
3) Reproduction: Produce offspring.
4) Adaptation: Evolve traits that fit the environment.
5) Growth and Development: Genes guide growth and development; offspring resemble parents.
6) Regulation: Internal processes maintain function (e.g., nutrient transport).
7) Homeostasis: Maintain internal conditions within a narrow range despite external changes; e.g., thermoregulation.
8) Energy Processing: Require energy to power metabolism; sources include chemical energy (food) and solar energy (plants).

Negative Feedback Loop: Responds to a change by reversing/reducing it.
- Example: Temperature regulation where body temp exceeds 37^\u00B0 C triggers sensor nerves, brain control, and effectors (e.g., sweat glands).
Positive Feedback Loop: Amplifies a change, driving system away from original state.
- Example: Oxytocin-induced contractions during childbirth; cervix stimulation leads to more oxytocin release and stronger contractions.

Observation
Question
Hypothesis: A simple, testable, falsifiable explanation for why something is happening.
- Must be testable; must be falsifiable (can be disproven)
- Cannot be proven; can only be supported or refuted
Prediction: A forecast derived from the hypothesis
Experimentation
Analysis
Reporting

Example 1: Salt amount vs taste satisfaction
- Independent Variable: Amount of salt added to the dish (e.g., $0.5$ tsp, $1$ tsp, $2$ tsp)
- Dependent Variable: Taste satisfaction (rating on a scale, $1-10$ )
Example 2: Seating arrangement vs student participation
- Independent Variable: Type of seating arrangement (e.g., traditional rows, circular seating, group tables)
- Dependent Variable: Level of student participation (e.g., number of hands raised or class discussion participation)