Canal system is a characteristic of

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(B) . Sponges (Phylum $Porifera$) possess a unique water transport or canal system. Water enters through minute pores called $ostia$ in the body wall

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Sponge

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(B) . Sponges (Phylum $Porifera$) possess a unique water transport or canal system. Water enters through minute pores called $ostia$ in the body wall into a central cavity,the $spongocoel$,and goes out through the $osculum$. This pathway of water transport is helpful in food gathering,respiratory exchange,and removal of waste products.

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