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A fish takes in water through its mouth. The water contains dissolve oxygen. The water flows through gills at the back of the fish's head and out through the holes at the sides. Oxygen passes from the gills into the fish's bloodstream. |
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A fish takes in water through its mouth. The water contains dissolve oxygen. The water flows through gills at the back of the fish's head and out through the holes at the sides. Oxygen passes from the gills into the fish's bloodstream. |
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When water is boiled the oxygen is removed, so fish, tadpoles and other marine creatures could not survive. |
