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Originally Posted by Mike33
Evolution presupposes that traits with benefits will be introduced and reproduced to keep a species alive and flourishing in its environment. Mutations therefore are not an example of evolution in the purest sense because they do the opposite.
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I don't pretend to be an 'expert' in evolutionary theory but here's what I understand of it. A species thrives in the environment it's most suited to live in. Within every species there are mutations that almost never give an advantage until there is a dramatic shift in the environment. At that point what was originally a disadvantage is now an advantage and that mutation is now spread through out the surviving members of that species.