fish open and close there mouth very quickly why ?
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Explanation:
some fishes, all fishes constantly open and close their mouths for breathing. By this, they take water in the mouth and pass it over their gills so that the gill filaments and the closely nit blood capillaries on them absorb the dissolved oxygen from the water and in exchange give out the carbon dioxide.
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Answer:
because they need oxygen for various processes and they take dissolve oxygen from water and close their mouth .They don't have lungs ,they have gills to take oxygen from water and pass the water from it .
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