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a
Water vascular system
b
Polyp and medusa stages
c
Canal system
d
Comb plates
answer is C.
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Detailed Solution
Sponges are characterised by the presence of a canal system. Water vascular system is the characteristic feature of echinoderms. Polyp and medusa stages are found in the life history of cnidarians. Comb plates help for locomotion in ctenophores.