Find reliable reference information to help answer these QUESTIONS about freshwater sponges:
1) Through what structure does water exit the sponge?
2) Through what structures does water enter the sponge?
3) What structures inside the sponge produce the water currents?
4) What benefits does the sponge gain by pumping water?

RELATED LINKS:

Reaggregation Living sponge Sponge osculum
Gemmules hatching Fossilized spicule Background

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