Explore biology topics with Khan Academy, offering free resources to learn about cells, genetics, evolution, ecology, and more.

Learn AP Biology using videos, articles, and AP-aligned multiple choice question practice. Review the fundamentals of biochemistry, cell biology, genetics, evolution, and ecology, and develop scientific …

This unit is part of the Biology archive. Browse videos and articles by topic. For our most up-to-date, mastery-enabled courses, check out High School Biology and AP Biology.

We’re excited to share that Khan Academy will continue to partner with AAMC for years to come, ensuring continued access to free, trusted, high-quality MCAT study resources for all learners. Learn …

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Learn high school biology using videos, articles, and NGSS-aligned practice. Explore the fundamentals of cells, organism growth and development, photosynthesis and cellular respiration, molecular and …

Explore macromolecules in biology with Khan Academy's free, world-class educational resources.

In the intro to biology video, we defined biology as the branch of science concerned with the study of living things, or organisms. That definition is pretty straightforward. However, it opens the door to …

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If you are curious about biology or plan to study it in the future, you may be wondering what "prerequisites" it has – that is, what other knowledge will give you a solid foundation to learn biology. …