What would humans look like if they lived 50-100,000 years 6 to 9 km above sea level?

What would humans look like if they lived 50-100,000 years 20,000-30,000 feet / 6 to 9 km above sea level? Or 500,000 years?

Would we have bigger lungs / chests? Bigger wider noses? Thicker skin and fattier bodies (to insulate from cold)? Thicker hair? Taller or thinner bodies?

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What would humans look like if they lived 50-100,000 years 6 to 9 km above sea level?

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