Ontogeny recapitul-: ates phylogeny. That means that during embryonic development, the embryo goes through physical forms that mimic your ancestors, rather than just develop right into a human. An early human embryo looks very much like our amphibian and then dinosaur (well, chicken, which is really the same thing) ancestors, and then many early structures wither and die, being replaced by more advanced species.
Answered 10/10/2015
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