Fewpal
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why is the rate of breathing in aquatic organisms much faster than terrestrial organisms

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Aquatic animals take in the oxygen dissolved in water. The amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. Therefore, rate of breathing in aquatic organisms is much faster than in terrestrial organisms.
Oxygen concentrations are much higher in air, which is about 21% oxygen, than in water.

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