The Origin of Vertebrates - Part 2: Telling the Back from the Front or What the Chordates Invented (27:47)

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In Part 2: Telling the back from the front or what the chordates invented, Marc Kirschner (Harvard Medical School) discusses why we look like invertebrate animals turned upside down, i.e. vertebrates have their central nervous system on their backs and invertebrates have it on their bellies.