Wouldn’t it allow for greater genetic proliferation if every member of a race could mate with each other?
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That’s a question to ask the apathetic direction in which evolution happens! There isn’t a definitive reason. Evolution isn’t “survival of the fittest” the way people think it is. It’s actually fairly random and it just so happens that sometimes genetic mutations happen to be beneficial for a certain species’ survival in a certain location, so it sticks.
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