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Why cannot we breath under water?
Answer 1:

We actually can - it's just that water is much denser than air and as a result we can't get it in and out of our lungs quickly enough with the weak muscles that we have. Water also doesn't have as much oxygen in it as air does per unit volume, so we would have to breathe much more water than we do air. These two together are the reason why people drown.;



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