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Sponges are multicellular organisms yet ...

Sponges are multicellular organisms yet they have no respiratory organs. This is due to the reason that

A

the nmode of respiration is anaerobic.

B

presence of highly porous body through which water flows.

C

limited reqiurement of oxygen, neglecting need of separate system for respiration

D

the respiratory organs become non-functional in marine water

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The correct Answer is:
B
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