An important thing to realize about evolution is that it keeps a reserve population around with traits in a gaussian around the value that has maximum fitness. E.g. if 5'10" is the optimal male height, Gnon will keep 6'8" and 4'6" guys around.2
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3/ This is for the best, as environments change, and it is good to have "reserve" diversity in a population's genome.
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4/ All of this applies for traits above the neck as well as below.
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5/ But I'm drinking, so maybe the things that I find important aren't. Who can say.
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