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Originally Posted by Ustwo
No its not. Biological traits, environment, and evolution all effect the ability to reproduce, but its only the reproduction that matters. If your trait is to terminate your young, then it will effect reproduction, which can effect evolution. As genes wobble between extinction and fixation these traits matter, but only in how they effect reproduction.
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The study of natural selection focuses more on the passing of the traits that ensure reproduction.
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The basic concept of natural selection is that environmental conditions (or "nature") determine (or "select") how well particular traits of organisms can serve the survival and reproduction of the organism; organisms lacking these traits might die before reproducing, or be less prolific
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Of course reproduction plays a part, but it is only one facet amongst many.