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Most organisms, except for some such as anaerobic bacteria, respire oxygen. Fish have gills, gills have the ability to take the oxygen out of the molecule H2O.
Fish have gills, which filter out the oxygen from the water. However, they can't breath out of water.
A fish doesn't have lungs, it has gills, so it doesn't breathe in water really.

Fish breathe under water by using their GILLS

to survive


Gills pull oxygen from the water but they can't breathe out of the water because the other chemicals in the air.

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7y ago

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