Cellular organization of body is present in

Annelida

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Platyhelminthes

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Porifera

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Urochordata

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Solution

The correct option is B Porifera
Members of Porifera have a cellular grade of organization. They do not possess any structures that can be considered organs.
Annelida, Platyhelminthes and Urochordata have organ level organisation
So, the correct answer is 'Porifera'

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