Natural Selection and personality traits!!?

So far what i've read about natural selection, it always says about the physical traits that are naturally selected to enhance the probability of survival. But none of it have mentioned about the implicit qualities such as personality or psychological traits. Two people having the similar intelligence might... show more So far what i've read about natural selection, it always says about the physical traits that are naturally selected to enhance the probability of survival. But none of it have mentioned about the implicit qualities such as personality or psychological traits. Two people having the similar intelligence might have different ways of handling difficult situation, just because of different personality or psychological traits. I don't mean it just for human but other animals too that have evolved into intelligent beings. Pardon if my questions are not technically correct, but you get the gist.
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