Ostia are present in

Poriferans

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Coelenterates

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Annelids

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Molluscs

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Solution

The correct option is A Poriferans
All sponges possess ostia, which are channels leading to the interior and in most sponges these are controlled by tube-like porocytes, that form closable inlet valves. Water comes through ostia into spongocoel.
Hence the correct option is A.

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