Why aquatic animals are able to respire in water?
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Terrestrial (land) animals, inhale air through their noses, mouths, and even their skin, to bring oxygen to their lungs. Water has oxygen too. Fish get the oxygen their bodies need by pumping water over their gills. That's why fish keep opening and closing their mouths all the time: they're breathing.
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Why aquatic animals are able to respire in water?
Aquatic animals use oxygen gas dissolved in water to respire.
The oxygen dissolve in marine water by diffusion from the surrounding air; aeration of water that has tumbled over falls and rapids; and as a waste product of photosynthesis. This dissolved oxygen is then used by marine animals for respiration.
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