Respuesta :

Air is less dense than water, which makes it easier to breath, and air contains a higher concentration of oxygen.
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Explanation:

Oxygen in the air is present in a higher amount, at least 20 times higher. Another important factor is the efficiency, oxygen in the air is in free form in contras with water, where oxygen is found bonded to two hydrogens, this means that in the air you need less volume to obtain the same amount of oxygen.

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