Question

how is the circulations of blood in fish diffrenet form that in humans​

Answer 1

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1. Fish has only single circulation and oxygenated and deoxygenated blood are mixed for a fish.
2. Whereas humans have double circulation, without the mixing of oxygenated and deoxygenated blood.

Answer 2

In fishes, blood circulation is called single circulation due to the presence of a two-chambered heart whereas double circulation takes place in human beings due to the presence of a four-chambered heart.