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You are misunderstanding Darwin's findings. I don't mean to harp on this to be mean spirited but given your tone I'm assuming you are not the sensitive type :)
Environmental pressures only select for traits of organisms, they don't alter genetic code. The variation occurs through random...
Nothing really to do with Darwin or natural selection as far as I know. Natural Selection involves a random mutation being expressed as a trait that is beneficial, that mutated example lives longer (because of this benefit) and produces more offpring, eventually animals with that trait take...
