Osculum occurs in

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(D) Sponges belong to the phylum $Porifera$. They possess a unique water transport system. Water enters through minute pores called $ostia$ in the bod

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Sponge

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(D) Sponges belong to the phylum $Porifera$. They possess a unique water transport system. Water enters through minute pores called $ostia$ in the body wall into a central cavity,the $spongocoel$,and goes out through a large opening called the $osculum$. Therefore,the $osculum$ is a characteristic feature of sponges.

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