Quote:
Originally Posted by Zeraph
Actually it selects for mutations which happen spontaneously. Otherwise we would have never evolved into humans if it only ever selects current adaptive qualities. It's just the mutations are usually worse than better, and getting the right bunch of mutations to make a significant difference in an animal takes quite few tries.
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True, and those mutations are random, and not influenced by what an organism "needs". If an adaptation is useful or necessary, and the mutation that leads to it is possible, there is still no guarantee that the mutation will arise in the first place.