Write the mechanism by which fishes breath in water.
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As the water passes over the thin walls of the gills dissolved oxygen moves into the blood stream and carbon dioxide is released out into the water. A fish breathes by taking water into its mouth and forcing it out through thegill passages.
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Fish take in oxygen-rich water via their mouths and pump it over their gills. When water moves over the gill filaments, the blood within the capillary network takes up the dissolved oxygen.
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