Question

What did you understand by open circulation and closes circulatory system?​

Answer 1

In the open circulation, the blood is not enclosed in the blood vessels and is pumped into a cavity called hemocoel. On the contrary, in the closed circulation, the blood is pumped through the vessels separate from the interstitial fluid of the body.

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Answer 2

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Open circulatory :- Organs simply washed in blood because it does not flows in vessels.

Closed circulatory :- Blood flows in vessels.Substance exchange is through diffusion.