Re: What prevents evolution?
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You are entirely positive that, for example, a human egg and a chimpanzee sperm could not be competent? And if that IS obvious, it is equally obvious for ALL groups that we currently consider different species? The vast majority of 'cannot breed' is really just 'does not ever breed for various reasons, morphological and behavioral being primary ones.;
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They are not competent.
The overwhelming majority of what we call species are infertile with each other - as in cannot produce fertile offspring.
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