A) locomotion
B) circulation
C) feeding
D) defence
Correct Answer: A
Solution :
Water vascular system is a division of the coelom and most distinctive feature of echinoderms. It is a system of canals and body wall appendages and also term as ambulacral system which functions as a means of locomotion. It consists of sieve plates, stone canal, water ring or ring canal, radial canals and podia or tube feet.
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