Biology · Unit 3

Biology Unit 3: Communities and Biodiversity

9 topics · Start with Biodiversity and Ecosystem Services

Unit 3 looks at the communities that organisms live in. You will describe and measure biodiversity, compare land and water ecosystems, explain how species interact, follow how a community rebuilds after a disturbance, and evaluate ways to reduce human impacts on biodiversity.

Study Tips for Unit 3

• Use the words richness, niche, and keystone species precisely. Many questions depend on knowing exactly what each one means.
• For data questions, write a claim, quote numbers from the graph with units as evidence, and explain the link in your reasoning.
• When a question asks you to predict, name what changes first, then trace the effect through the food web or community.

Unit 3 Study Guide

A printable review of all 9 topics, with an answer key, is coming soon. Until then, use the practice worksheet at the end of each lesson.

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