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Discussion 4 to Meditation 447
There is plenty of evidence

by David Marjanović

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Forget the Chemical and Engineering News. It is true that Darwin didn't give an example of witnessed speciation in any of his books. But nowadays we have plenty of such cases to illustrate Darwin's theoretical conclusions. The most obvious one I know of is a case of diatoms in the Pacific where you can watch how one population -- gradually, not stepwise -- splits in two over a few hundred thousand years. I'm too lazy to look up the reference right now, but there is plently of literature out there. Seek, and ye shall find.