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History of life on Earth

Our planet has an amazing history spanning about 4.5 billion years! Learn more about how Earth formed, the early history of life on Earth, and the origins of humans.This course...

Khan Academy

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Human biology

Your body is an amazing system! The human body is made up of groups of organs, called organ systems, that work together to keep the body in balance. In this section, we'll travel...

Khan Academy

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Plant biology

Plants may seem less interactive than animals. But they actually have many ways of responding to their environment, changing their growth or physiology to make the best use of...

Khan Academy

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Meet the biology professional

Do you enjoy your biology class, like nature, have an interest in medicine, or simply feel lots of curiosity about living things? If so, you may be thinking about focusing on or...

Khan Academy

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Prepare for the 2018 AP Biology exam

This course contains 5 segments:Free-response questions: 2015 AP Biology examPrepare for the AP Biology exam by going through real free-response questions from the 2015 exam with...

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Atoms, compounds, and ions

This course contains 3 segments:Introduction to the atomIn chemistry, we will often be thinking about the world on a much smaller scale than you can see with the naked eye. Here...

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Electronic structure of atoms

This course contains 3 segments:History of atomic structureHow did scientists figure out the structure of the atom, and how did they discover subatomic particles? The answer is...

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Gases and kinetic molecular theory

This course contains 1 segments:Ideal gas equationIn this tutorial, Sal shows you how to use the ideal gas equation in calculations.

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Kinetics

This course contains 4 segments:Reaction rates and rate lawsIn this tutorial, we will examine the rates of chemical reactions and learn how to write rate laws. Relationship...

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Thermodynamics

This course contains 4 segments:Internal energyAn introduction to the first law of thermodynamics, internal energy, heat, work, and PV diagramsEnthalpyAn introduction to enthalpy...

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