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How do fish breathe underwater?

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Fish breathe underwater using gills. Gills are feathery structures located on the sides of their head that are covered by a protective bony flap called the operculum. As fish swim, water enters their mouth and passes over the gills. Inside the gills, oxygen diffuses from the water into the fish's bloodstream, while carbon dioxide moves out of the fish's bloodstream and into the water. This process allows fish.

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