why couldn't we breathe underwater?there is oxygen in water as water is H2O.then why can't we utilise that oxygen?

Humans cannot breathe underwater because our lungs do not have enough surface area to absorb enough oxygen from water, and the lining in our lungs is adapted to handle air rather than water. However, there have been experiments with humans breathing other liquids, like fluorocarbons. Fluorocarbons can dissolve enough oxygen and our lungs can draw the oxygen out.

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We do not have gills like fish which separates oxygen and water

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The difference is that we have lungs, which are not modified to utilze the oxygen underwater like in the case of gills that fishes have.

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You can try for you'rself.

(Caution) Many people sucide using this method.Dont try at home.

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