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Question

Circulatory system of Echinoderms is______________.

A
Closed
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B
Open
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C
Haemal
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D
Both B and C
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Solution

The correct option is C Both B and C
Echinoderms have an open circulatory system with cilia circulating the fluids through each arm. Echinoderms have a network of fluid-filled canals that function in gas exchange called haemal system.
So, option D is the correct option

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