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Science; Middle school biology; Middle school Earth and space science; Middle school physics; High school biology. NEW. High school chemistry. NEW. High school physics. NEW. Hands-on science activities. NEW. AP®︎/College Biology; AP®︎/College Chemistry; AP®︎/College Environmental Science;
Biology at Khan Academy explores life in all its forms, from humans to bacteria and how living things convert energy, grow, and reproduce. The course covers key biological molecules, the role of DNA, and the complexity of cells.
This unit is part of the Biology library. Browse videos, articles, and exercises by topic.
Science; Middle school biology; Middle school Earth and space science; Middle school physics; High school biology. NEW. High school chemistry. NEW. High school physics. NEW. Hands-on science activities. NEW. AP®︎/College Biology; AP®︎/College Chemistry; AP®︎/College Environmental Science;
The biology archive contains legacy biology content, and is not being updated with new content. Exercises and mastery mechanics will soon be removed from the biology archive. For our most up-to-date, mastery-enabled courses, check out High School Biology and AP Biology!
This unit is part of the Biology library. Browse videos, articles, and exercises by topic.
Learn about life processes in biology with Khan Academy's comprehensive and interactive resources.
Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
In biology, an organism's niche refers to the role it plays in a community. It encompasses both the physical and environmental conditions it requires and the interactions it has with other species. The niche describes how an organism responds to the distribution of resources and competitors, and how it, in turn, alters those same factors