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Study the following characters.
a) Diploblastic and tissue level of organisation
b) Central cavity with mouth on hypostome
c) Alternation of generation
All the above characters are applicable to

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Oscarella

Obelia

Otter

Ophiothrix

answer is B.

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Detailed Solution

Coelenterates like Obelia are diploblastic with tissue level of organisation. Central cavity is with the mouth and it exhibit alternation of generation.

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