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Does the subject's awareness of the selection matter?
The premise here was that they noticed in time to not die... So, yes?
Ah I misread it.
I reckon it's not so much about noticing in absolute terms (to notice vs not to notice), but rather about the smallest difference that smelly hair would make. Amplify that over millions of years and smelly hair has a good chance of being everywhere eventually.
I dunno. I'm just having trouble conceptualizing any kind of scenario that could happen with enough frequency to cause this trait to be selected for.
I think it's more likely that the chemicals in hair just happen to smell bad when burnt. Those chemicals may have been filtered for other reasons.
Yea that could also very well be, that it was pre-existing and had no impact during evolution. I could see there being an evolutionary advantage to hair smelling bad. That's as far as my confidence and knowledge reaches on the matter. Very interesting nonetheless! :)