Hank gets real with us in a discussion of evolution it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

Table of Contents
1) The Theory of Evolution 1:49
2) Fossils 2:42
3) Homologous Structures 4:36
4) Biogeography 7:02
5) Direct Observation 8:52

References:
http://www.hisl.ent.msu.edu/discussio...
http://wwwpersonal.umich.edu/~ginger...
http://evolution.berkeley.edu/evolibr...
http://www.thomsonedu.com/community/r...
http://articles.latimes.com/2010/jul/...
http://www.ncbi.nlm.nih.gov/pmc/artic...
http://news.nationalgeographic.com/ne...

Crash Course is on Patreon! You can support us directly by signing up at   / crashcourse  

Want to find Crash Course elsewhere on the internet?
Facebook   / youtubecrashcourse  
Twitter   / thecrashcourse  
Instagram   / thecrashcourse  

CC Kids:    / crashcoursekids