raguel
Posts: 107
Joined: Feb. 2008
|
How exactly does this:
| Quote | | To the limited extent that von Baer had shown 40 years earlier, this is true. |
contradict with this:
| Quote | | But embryos also have many unique features (yolk sac, allantois, amniotic membranes, umbilical cords) that have nothing to do with the evolutionary past and are adaptations to their developmental environment. Thus it is dangerous to overextend the evolutionary implications of the stages in the embryo, but they are useful guides nonetheless. (p. 108) |
Also: are we to pretend that there's no difference between gills and gill slits, and that mammalian embryos don't have gill slits?
|
