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Question

Which organ system is lacking in the animals that have a water vascular system?

A
Nervous system
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B
Circulatory system
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C
Excretory system
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D
Sensory system
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Solution

The correct option is C Excretory system
Water vascular system is characteristic feature of echinoderms. In echinoderms, a specialised excretory system is absent. The excretory products diffuse out from the body tissue into coelomic fluid from where waste is eliminated out.

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