MartinV writes:
quote:
it could be the pelvis channel that should accomodate during evolution to the child head.
But one of those things is more malleable than the other. When you press a piece of putty to the wall, the interface between them becomes complimentary, but it isn't the wall that's adjusting to the putty.
Now, while it is true the bones of the pelvis will shift during childbirth, they aren't going to shift nearly as much the fetus will be able to. Notice, childbirth is pretty taxing on the fetus as it is. It needs to turn upside down (which happens late) and then needs to pretty much corkscrew its way out in order to make it not only through the pelvic opening but around and by the sacral curves.
If there were a pressure on the female body to make it easer for childbirth, then the pelvis would be much more accomodating than it currently is. Since it isn't, since the fetal morphology is the one doing most of the work, it would appear that it is easier to adapt the fetus to the mother than the mother to the fetus.
Rrhain
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