Such a gigantic flood would creat a HUMONGOUS genetic bottleneck, and thusly there would be evidence in Human DNA, not to mention other animals'. I do not know about other species, but Humans are fairly tight-nit genetically, and this (along with other things I don't have time to type) indicates that there was such a bottleneck. However, the time span required to diversify the entire human race is large.
On the subject of Evolution, why are black skinned people black? Because it was beneficial in their environment. Have you ever heard of an African getting sun-burned?
This is an evolution designed to protect the skin.
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