Hollow/Blind sac plan occurs in ___________.

Porifers

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Coelenterates

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Flatworms

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Both B and C

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Solution

The correct option is D Both B and C
D. Both B and C
Reason: Blind sac body plan is a type of incomplete digestive system found in coelenterates and flat worms. In this type of body plan animals has a single opening that act as an opening for both the ingestion and egestion process. So the correct option is D.

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