Why did nature cause male and female to evolve, when the best method would have been to continue to asexually reproduce?

Why did nature cause male and female to evolve, when the best method would have been to continue to asexually reproduce?
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Answer :

Why do you assume that asexual reproduction is “the best method”? I, in fact, would argue that evolution indicates that it’s not the best method to get the gene pool mixing.
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