1. Biology: How Life Works

Biology asks how organisms are built, how they function, how they reproduce, and how they interact with their surroundings.

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Every organism is made of cells that take in materials, use energy, communicate, and follow instructions stored in DNA.

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Evolution explains both the shared features of living things and the remarkable variety of species adapted to different environments.

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Biology appears in vaccines, nutrition, agriculture, disease outbreaks, wildlife protection, and decisions about the environment.

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Biologists work in laboratories, hospitals, farms, parks, museums, technology companies, and field sites, tackling questions about health, organisms, and ecosystems.

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Review this chapter with practice based on your mistakes.