Q.

In which of the following animals, is open circulatory system found?

A. Prawn
B. Earthworm
C. Toad
D. Man
Answer» A. Prawn
Explanation: The open circulatory system is a system in which fluid in a cavity called the hernocoel bathes the organs directly with oxygen and nutrients and there is no distinction between blood and interstitial fluid; this combined fluid is called hemolyrnph or hemolymph. Arthropods and mollusks have an open circulatory system.
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