(C) In a sponge,water enters through the $ostia$ and exits through the $osculum$. The $osculum$ is the exhalant pore. Therefore,if carmine particles a

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(C) In a sponge,water enters through the $ostia$ and exits through the $osculum$. The $osculum$ is the exhalant pore. Therefore,if carmine particles are placed near or above the $osculum$,the water current flowing out of the sponge will carry these particles away from the body.