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B
Coelomic fluid
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C
Respiratory fluid
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D
All of the above
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Solution
The correct option is B Coelomic fluid The water vascular system is a modified part of coelom and consists of a system of sea water filled canals having certain corpuscles. Therefore, coelomic fluid is present in water vascular system. It plays a most vital role in the locomotion of the animals and comprises madreporite stone canal, ring canal, radial canal, lateral canals and tube feet.