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Real organs are absent in
(a) Mollusca
(b) Coelenterata
(c) Arthropoda
(d) Echinodermata
Correct Answer: (b) Coelenterata
Explanation:
Coelenterates are radially symmetrical and motile organisms, that either live in colonies or as solitary organisms.These organisms have a coelenteron, a body cavity with only one opening. They don't have real organs.
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