The single main opening of the sponge cavity is____________?
Correct answer: A. Osculum
- A. Osculum
- B. Ostia
- C. Spongocoel
- D. None of these
Explanation
The osculum is the single main outlet through which water leaves a sponge after passing through its canals and spongocoel. Ostia are numerous small incoming pores, while the spongocoel is the internal cavity rather than an opening. Students commonly choose b because ostia are also openings, but they are many small inlets, not the main outlet.
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