How do fish gills convert water to oxygen, if it does already?
In: Biology
They don’t. There is oxygen in the water, just like there is oxygen in the air.
When you breath in the air around you your lungs don’t do anything with the nitrogen that it is mostly made up of. Similarly the fish don’t try to actually do anything with the H2O molecules that the water is mostly made up of but only filter out the oxygen that is freely accessible dissolved in the water.
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