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Why we did not take oxygen and respire in water although it contains (H2O) both hydrogen and oxygen molecule ? give reason for answer




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Humans can't breathe underwater. Chemically when hydrogen and oxygen gases combine we get liquid water. Oxygen is bound to two hydrogen atoms in water and so we cannot breathe .
then raises the doubt how do fishes breathe? Fishes have the capacity to remove the dissolved oxygen through their gills. But human lungs do not have this capacity.
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