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Re: Is close enough good enough?
There is no reason why anything shouldn't be free to mutate wildly. Of course, for something to stay the same for a million years, it would suggest that the selection pressure was for the current feature set. Anything a bit better will be selected for, so that will become the dominant form. Once it has reached that plateau, it can stay like that for a million years, as long as nothing else changes and selects against it.
Of course, as a friend once said, "Evolution is hard on Aardvarks and the causes of Aardvarks"! Over-specialism is sure to kill you when things change, as you will have far further to adapt than the less successful who have yet to adapt fully to current conditions. If they get there first, they out-breed you, and you wind up having to find another place to evolve to.
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