• Three themes in biology are the unity of life's diversity, the interdependence of organisms, and evolution of life.

• Living organisms show diversity and can be classified into domains and kingdoms.

• Organisms live in interdependent communities and interact with both organisms and the environment.

• Evolution helps to explain how species came to exist, have changed over time, and adapt to their environment.

Vocabulary domain (p. 11) kingdom (p. 11)

evolution (p. 12) natural selection (p. 12)

adaptation (p. 12)

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