What is anyone's guess? The brain isn't a trait. It's something that evolved due to natural selection? Do you accept natural selection?
See. Conversation works much better when you say what you mean clearly in whole sentences.
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The evidence that our brains have adapted is the evidence that our brains have evolved and evolution works by natural selection.
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But whether a specific cognitive ability or psychological trait is an adaptation or by-product of something else is less certain.
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it's unknowable
End of conversation
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