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

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 School Biology …

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 and AP …

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, …

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 …

Unit 12: DNA as the genetic material 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 …

Explore how feedback mechanisms maintain homeostasis in biological systems. Understand how hormone concentration and metabolism are regulated through negative feedback.

Practice Course Grade 6 Science 4,200 possible mastery points Mastered Proficient

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 …

New high school biology course available! This course has been deprecated. We recommend exploring our improved high school biology course instead.