Sponges are porifera because their bodies have:

Spicules in skeleton

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Several pores

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Canal system

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All the above

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Solution

The correct option is B Several pores
Sponges belong to phylum Porifera. The term 'Porifera' is a Latin word which means pores to bear. Sponges have a porous body. The body has numerous inhalant pores called Ostia and an exhalant pore called Osculum. Water enters through Ostia and leaves through Osculum.
So, the correct answer is option B.

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