Khan Academy: Training Trees Quiz

Even basic evolutionary trees reveal insights into how different species are connected. Learn how to interpret and create them in this tutorial. [2:43]

The biliary tree (also known as the biliary tract or biliary system) is comprised of the gallbladder, liver and bile ducts. These structures produce, store, and release bile to the small intestines, where it aids in the digestion of...

Test your knowledge of gem carving with this seven-question quiz.

Learn what a phylogenetic tree is, Learn how to read phylogenetic trees and determine which species are most related.

Try this quiz about severe storms.

Dicover the science of taxonomy and where humans fit into the tree of life. [12:41]

Follow the path of an oxygen molecule as it makes its way from your mouth down to an alveolus! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Test your knowledge of the origin of the Universe stories that were discussed in the What is Big History module on Khan Academy.

Get ready for the AP Biology test by reviewing over worked examples of free response. This problem asks students to think about evolutionary distance between species and constructing phylogenetic trees or cladograms.

This video explores the science of taxonomy and where humans fit into the tree of life. [12:41]