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Just think Inuit or Aboriginal - both living in environments of opposing extremes, surviving just fine for many, many years...

Yex, they adapted over millenia. I don't see what relevance this is to this particular issue though.

Did they really adapt over millennia? There's a lot of relevance if you keep your eyes open.

Yes, physological changes that they have don't appear overnight. https://library.ucdavis.edu/wp-content/uploads/2022/07/Lang-...

Did any of the physiological changes appear overnight?