Everything is connected. Including your bad study habits and your test score.
Matter cycles through ecosystems; usable energy flows through and disperses as heat.
Common trap: An apparently helpful behavior is not automatically conscious altruism. Identify measured costs, benefits, and relatedness rather than assigning motives.
Common trap: Energy is not recycled by decomposers. Nutrient atoms can cycle, while organisms continually need an energy input.
Common trap: Carrying capacity is not a permanent species characteristic. Resources, habitat, climate, and interactions can change it.
Common trap: A large population is not necessarily a dense one: density depends on the area or volume occupied.
Common trap: Do not assume every species removal causes all other populations to move in the same direction. Trace each interaction.
Common trap: More species does not mean every possible disturbance will have no effect. Specify the function, disturbance, and evidence.
Common trap: Do not say fertilizer directly sucks oxygen out of water. Trace nutrient input → production → dead organic matter → microbial respiration → lower oxygen.
Original review notes informed by standard biology principles. Check the official AP Biology framework ↗ and OpenStax Biology 2e ↗ for further reading.