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Are all coral reefs the same? Each regional ecosystem has its own assemblage of species and each contributes uniquely to global biodiversit…

Examples showing how different types of bond configurations can be represented using resonance structures. Organic chemistry Sal and Jay co…

Understanding the structure of a muscle fiber. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to …

Could silicon play a role similar to carbon's in supporting life? Biology Life is beautiful! From atoms to cells, from genes to proteins, f…

Innate vs. adaptive immunity. Humoral adaptive immunity vs. cell-mediated adaptive immunity. Biology Life is beautiful! From atoms to cells…

Cambrian explosion and biodiversity in the Phanerozoic Eon Biology Life is beautiful! From atoms to cells, from genes to proteins, from pop…

Learn about the many types of interspecific interactions: competition, predation, herbivory, symbiosis, parasitism, mutualism, commensalism…

Hank discusses the history of life on Earth (including major events such as oxygenation of the atmosphere and mass extinctions). Biology Li…

Example of graphing first-order rate data to see a linear relationship, and calculating rate constant k from the slope. Chemistry Did you k…

Black Holes Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the brain-ben…

Bronsted-Lowry definition of acids and bases. Conjugate acids and bases. Chemistry Did you know that everything is made out of chemicals? C…

Defines electronegativity and compares to electron affinity. Explains group and period trends in electronegativity using atomic radii. Chem…

Organic chemistry naming examples 4 Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understan…

How to name bicyclic compounds. Numbering the chain and Identifying bridgehead carbons. Organic chemistry Sal and Jay cover topics covered …

Using an amino acid translation table to understand the impact of point and frameshift mutations. High school biology DNA replication and p…