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2015-12-15T14:00:53+05:30

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Here is the circulatory system of fish:

Fish has two hearts. When they inlet water, the oxygen from the water passed to their gills, this oxygen then mixed up with the water, passed to the body and then the deoxygenated blood is then come back to the fish heart and so on.

This process repeats on whenever the fish take water.
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