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The water leaves the body of sponges through

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spicules

spiracles

osculum

ostia

answer is A.

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Detailed Solution

In sponges, water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum.

Spicules form skeleton of sponges.

Spiracles are the lateral openings for gas exchange in a cockroach.

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