14.16: Morphology of Sponges - Biology LibreTexts
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WEBFeb 28, 2021 · Choanocytes (“collar cells”) are present at various locations, depending on the type of sponge, but they always line the inner portions of some space through which water flows (the spongocoel in simple sponges, canals within the body wall in more complex sponges, and chambers scattered throughout the body in the most complex sponges).
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