Hank veers away from human anatomy to teach us about the (mostly) single-celled organisms that make up two of the three taxonomic domains of life, and one of the four kingdoms: Archaea, Bacteria, and Protists. They are by far the most abundant organisms on Earth, and are our oldest, oddest relatives.

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Table of Contents
1) Archaea 03:23
a) Methanogens 04:02
b) Extremophiles 04:24

2) Bacteria 05:24:2
3) Gram Positive 06:50
a) Proteobacteria 07:15
b) Cyanobacteria 07:30
c) Spirochetes 07:42
d) Chlamydias 07:52

4) Protists 08:12
a) Protozoa 09:03
b) Algae 09:54
c) Slime Molds 11:13

crash course, biology, archaea, bacteria, protists, unicellular, life, origin, evolution, evolve, eukaryotic, prokaryotic, nucleus, cell membrane, cytoplasm, ribosome, DNA, chromosome, plasmid, extremophile, methanogen, hydrothermal vent, halophile, parasitic, antibiotic, immune system, horizontal gene transfer, diverse, gram staining, gram positive, proteobacteria, cyanobacteria, spirochete, chlamydia, protozoa, algae, dog vomit, slime mold, heterotrophic, flagella, cilia, amoeba, photosynthesis, diatom, sailor's eyeball, bubble algae, seaweed, green, red, brown Support CrashCourse on Subbable: http://subbable.com/crashcourse