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Q. Why do fish need gills?
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Answer:
Like us, fish also need to take in oxygen and expel carbon dioxide in order to survive. But instead of lungs, they use gills. ... As the fish opens its mouth, water runs over the gills, and blood in the capillaries picks up oxygen that's dissolved in the water.
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Gills are responsible for respiration in aquatic animals like fishes, crabs etc. Gill helps the aquatic animals to extract oxygen from the water and excretes carbon dioxide. ... Gills are present on the side of fish head. Fishes don't have the lungs to respire but they have Gills
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