I always enjoy a good restating of the logic of evolution, because it's just so darned beautiful and simple. PZ Meyers, in a
post about shithead Coulter's latest yapping, lays out a lovely summary:
If heritable variation exists, (which, of course, it does)
if excess reproduction occurs, (also obviously true, or we'd be up to our ears in mice)
if variants differ in their likelihood of survival and reproduction, (a little trickier, but still fairly obvious)
then the relative frequencies of the variants must change.
Go ahead and read the
whole post. PZ is a real treasure for education.
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