Unit 8 · Exam weight 10–15%

Ecology

Populations, communities, ecosystems, and biodiversity.

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Lessons

Behavior & Energy Flow

Behavior responds to stimuli; energy moves through trophic levels.

Population Ecology

Growth models and population structure.

Community Ecology

Species interactions shape community structure.

Biodiversity & Disruptions

Disturbances and human impact reshape ecosystems.

Featured diagram

Terrestrial food web with energy pyramid and 10% rule

Practice MCQs for this unit Practice FRQs