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.

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Table of Contents1) The Theory of Evolution 1:492) Fossils 2:423) Homologous Structures 4:364) Biogeography 7:025) Direct Observation 8:52

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evolution, theory, biology, science, crashcourse, genetics, gene, facts, fossil, fossil record, dinosaur, extinct, extinction, organism, dorudon, rodhocetus, vestigial, structure, similarity, homologous structure, related, relationship, morganucodon, fore limb, hind limb, vertebrate, molecule, DNA, RNA, chimpanzee, fruit fly, biogeography, marsupial, finches, direct observation, drug resistance, resistance, selective pressure, italian wall lizard Support CrashCourse on Subbable: http://subbable.com/crashcourse

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Evolution: It's a Thing - Crash Course Biology #20 - YouTube