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

The biology archive contains legacy biology content, and is not being updated with new content. For our most up-to-date, mastery-enabled courses, check out Middle School Biology, High …

Biology is built on top of physics, chemistry, math, and statistics.

Key points Ecology is the study of how organisms interact with one another and with their physical environment. The distribution and abundance of organisms on Earth is shaped by both biotic, …

Welcome to High School Biology! In this course, we will explore the beauty of life, from tiny cells to complex ecosystems. We'll explore organism structure, cellular energy, genetics, evolution, …

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Discover the diversity of life on Earth and the forces that shape it! In this section, you can learn about evolution, natural selection, and the tree of life.

How did you become interested in biology and what did you study? Growing up in Puerto Rico, I loved going to the beach and being in the ocean. When I was 12, I got my scuba diving …

What’s your one piece of advice for people interested in biology? Biology requires much more math and quantitative skills than many people realize, especially because we are able to …