Why Is Air A Better Respiratory Medium Than Water?

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Why Is Air A Better Respiratory Medium Than Water?

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Oxygen diffuses ~8000 times more rapidly in air than in water; O2 content can be almost zero only a few mm below surface of a stagnant pond; To move medium over a gas exchange site (ie respiratory organ), more energy is required to move water than air (as water is 800x denser and 50x more viscous than air)

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