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 …

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

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 …

Unit 1: Intro to biology About this unit 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 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 …

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, …

Learn biology using videos, articles, and NGSS-aligned practice. Review the fundamentals of cell biology, organism growth and reproduction, photosynthesis, cellular respiration, ecology, …

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 …

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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] …