A) Mollusca
B) Arthropoda
C) Annelida
D) Echinodermata
Correct Answer: D
Solution :
The characteristic feature of Echinodermata is the presence of water vascular system, which helps in the process of locomotion. It is a modified part of coelom and consists of madreporite, stone canal, ring canal, radial canal, Tiedemans bodies, lateral canals and tube feet.
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