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B
Gastrovascular cavity
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C
Water vascular cavity
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D
Coelenteron
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Solution
The correct option is A Paragastric cavity Spongocoel is the large, central cavity of the sponge. Water enters the spongocoel through hundreds of tiny pores (ostia) and exits through the larger opening (osculum). It is a paragastric cavity and is lined by epithelial cells.