Tree of life

4 videos
Learn about the relatedness of living organisms, how they are classified, and how a species is defined. Special bonus: take a look at the branch of the tree of life that includes bacteria, and learn more about viruses (which are almost, but not quite, considered living!).

Taxonomy and the tree of life

VIDEO 12:41 minutes
The science of taxonomy and where humans fit into the tree of life.

Species

VIDEO 8:49 minutes
What a species is and isn't. Ligers, tiglons, mule, hinnies, and dogs.

Bacteria

VIDEO 18:26 minutes
Introduction to bacteria.

Viruses

VIDEO 23:17 minutes
Introduction to viruses.