Mamals-I've thought about his for years
This mainly applies to mammals , I think.
The male has nipples. Could it be that at some point a didtant ancestor was Asexual. It seems to me that at some time it had to be. The male and female parts split away.
If yes, when would you suppose that happened, whilst still in the waters or on land.
I have no ideas other then whats stated.
Maybe just when entering the mamal stage, but both would have to have evolved at the same rate-even though being separte. I posed this to the Bio Smurf along time ago, but no answer other then speculations.
I'm reasonably sure there was a split.
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