What hypothesis?
What does that mean? *Please* be clear. What did our complex brains evolve as a by-product of?
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it's anyone's guess - every trait is co-extensive with an infinity of traits
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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?
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it's anyone's guess what our brains evolved as a by-product of - natural selection isn't explanatory
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I don't know what you mean. I think if you did, you could have made it clear by now so I'm going to leave it here.
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which part is unclear?
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I don't know what you mean.
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appeals to natural selection don't explain which of two co-extensive traits is an adaptation and which is a by-product of adaptation
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What do you mean by this? I'm sure you could explain clearly if you wanted to. Think about why you don't want to.
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