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Organ level of organization is found in
(a)Porifera
(b)Platyhelminthes
(c)Ctenophora
(d)Coelenterates

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Important Questions on Animal Kingdom
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The third germinal layer, that is, mesoderm appeared for the first time in

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Mark the odd one out with respect to examples of radial symmetry.

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Pseudocoelom is a feature of

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Open circulatory system is found in

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Blind sac body plan is found in
