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In circulatory system, valves occur in...

In circulatory system, valves occur in

A

Heart and blood bessels of both vertebrates and invertebrates as well as vertebrate lymphatics

B

Both vertebrate and invertebrate hearts

C

Vertebrate heart only

D

Both vertebrate and invertebrate hearts and their blood vessels.

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Assertion : Closed circulatory system is less efficient than open circulatory system Reason : The blood flow is slow is closed circulatory system than in open circulatory system.