Evolution Message Board - Msg: 29867056

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Politics : Evolution

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To: Brumar89 who wrote (64186)	12/24/2014 12:29:45 PM
From: 2MAR$	Read Replies (1) of 69300

Those aren't gill slits and no credible scientist would claim such now, that was the point. Haeckel's biogenetic law was never part of Darwin's theory and was challenged even in his own lifetime. Those are pharyngeal arches and all vertebrates have them as embryos & in human embryos they form certain structures of the neck and head as the embryo develops further. In the embryos of fish, the pharyngeal arches develop into the gill arches of the adult form. During the evolution of land vertebrates from their fish ancestors, those gill arches, or rather the boney and cartilage structures supporting them, evolved into the same structures of the neck and head that the arches develop into in the embryo of humans and other non-fish vertebrates. So we do see the development of the embryonic structures in humans reflecting the physical changes of our early ancestors as they evolved. So they are another example of the evidence for evolution, but human fetuses don't have "gill slits" . That such genetic traits do appear early on in any vertebrate fetal stage, all suggest left-over developmental stage from our earlier common biological past. All life evolved from the sea, evolution is as true as light & sunshine.

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