Water enters the sponge through tiny pores called ostia, collects in the central cavity (spongocoel), and exits via the osculum.
Water enters sponges through ostia, flows into the spongocoel, and exits through the osculum.
| Text | Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. |
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