In sponge biology, a small opening or pore through which water exits a sponge's body, opposite to the incurrent pores.
From Greek apo- 'away from' and pyle 'gate' or 'opening.' This zoological term describes the water-exit channels in sponge anatomy.
Sponges are basically tiny filter factories—water enters through thousands of pores called ostia, gets filtered for food by collar cells, and exits through apopyles, making sponges nature's original water purification system.
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