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Question
The animals which are exclusively aquatic, sessile, with cellular level of organisation of the body are placed in phylum _____
Options:
A .  Protozoa
B .  Porifera 
C .  Ctenophora
D .  Cnidaria 
Answer: Option B
:
B
Phylum Porifera includes the sponges, which are exclusively aquatic, sessile, and exhibit cellular level of organisation of body matter. It is also the only phylum that comes under sub-kingdom Parazoa in the Animal Kingdom.

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