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Single large opening at the top of spongocoel is called _____?

Single large opening at the top of spongocoel is called _____?

اسپونگوکوئیل کے اوپری حصے میں واحد بڑی افتتاحی _____ کہلاتی ہے؟
Explanation
  • The osculum is the large opening at the top of the spongocoel in sponges, through which water exits.
  • It plays a key role in the water filtration system of sponges.