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

Check what you understood with a short quiz.

Use what you learned in the previous lesson to solve real-world problems.

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

Check what you understood with a short quiz.

Use what you learned in the previous lesson to solve real-world problems.

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

Check what you understood with a short quiz.

Use what you learned in the previous lesson to solve real-world problems.

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

Check what you understood with a short quiz.

Use what you learned in the previous lesson to solve real-world problems.

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

Check what you understood with a short quiz.

Use what you learned in the previous lesson to solve real-world problems.

Review this chapter with practice based on your mistakes.