What prevents evolution?

[vhawk01]

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Selection, like something else I won't mention, happens.

It's the notion of speciation that's got issues with logic.

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But you said populations could become mutually infertile with each other.
(That's what speciation is)

And what's the something you won't mention?

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Actually, I totally agree with him. Speciation really is a logically meaningless distinction. I mean, unless 'species' only means EXACTLY cannot mate with any other species. But even thats iffy, they can mate, with varying success, some of the times.

Calling two different things different species is a (nearly completely) arbitrary distinction. If that was Skidoo's point (I doubt it was) then I agree completely.