Why does a mountain climber need an oxygen supplyat very high altitudes,even though the air still contains 21% oxygen?
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https://proficientwritershub.com/wp-content/uploads/2022/01/onlinelogomaker-012722-1716-5353-2000-transparent-300x61.png00Florencehttps://proficientwritershub.com/wp-content/uploads/2022/01/onlinelogomaker-012722-1716-5353-2000-transparent-300x61.pngFlorence2020-11-23 19:43:462020-11-23 19:43:46Why does a mountain climber need an oxygen supplyat very high altitudes,even though the air still contains 21% oxygen?