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[–] 8 points 4 months ago (2 children)

Tl:dr = Because they haven't. Yet. Maybe. As far as we know.

I think you've described it quite well. That's just evolutionary biology. Any adaptation requires some kind of pressure behind it.

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  • [–] 3 points 4 months ago (1 child)

    Not pressure, just absence of negative effects. Pressure might help but is not required. And I use "absence" quite loosey-goosey.

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