A) helminthes
B) coelenterates
C) sponges
D) echinoderms
Correct Answer: C
Solution :
Sponges have canal system. Body of sponge is perforated in such a way that it produces a canal system made up of osculum, ostia and gastrovascular cavity. Specialized collar cells are present in sponges. Beating of flagella of collar cells produce a water current, through which these obtain nutrition, respiration, etc.
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