Fish gills kind of work like human lungs. The
purpose of the gills is to gather oxygen.
Instead of getting oxygen from the air, fish get
oxygen from the water. The fish will swallow
water and force it through the gills. There are
blood vessels that are close to the surface of
the gills. Oxygen passes from the water and into
the blood vessels in the gills. The blood cells
carry this oxygen to the rest of the cells in
the fish body.
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