Learn about all the sciences, from physics, chemistry and biology, to cosmology and astronomy, across hundreds of videos, articles and practice questions.

Unit 1: Intro to biology Welcome to biology! The science of biology Water and life

Learn AP Environmental Science using videos, and AP-aligned practice. Review the fundamentals of ecosystems, biodiversity, populations, earth systems and resources, land and …

This unit provides exam preparation resources, including an overview of the exam format, a guide to practicing for the exam, and a vocabulary review. Get ready to crush the AP Computer …

Physics the study of matter, motion, energy, and force.

Review the fundamentals of biochemistry, cell biology, genetics, evolution, and ecology, and develop scientific thinking skills as you explore the study of life.

Review Supreme Court cases, study key amendments, and reflect on how the founders’ intentions and debates continue to influence politics in the Unite States today.

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] …

Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more.

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] …