Intermingling of the different "races" can also be seen as evolution. Where there were once two seperate "races" now there's a "new" 3rd. Mating between an Irish man and an African woman would produce a child that is more resistant to the effects of the sun than the father (due to more pigment in the skin), and one that may be less/more likely to have something like sickle cell than the mother. It would also possibly mix the blue eye'd gene (if the father had blue eyes) in with darker skinned/haired humans where it would be seen less. While the child would have brown eyes (due to the mother having brown eyes and the brown eye'd gene being dominant), they would still carry the blue eye gene which could be re-introduced with the child's child depending on his/her mate.
Also i kinda get the feeling that when lots of folks think of evolution they think about humans suddenly growing a third leg or somthing. While this would be a form of evolution it's more common to see things that are slightly less noticable such as more resistance to diseases, infection, sun burn.. etc.
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