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B
Coelenteron
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C
Gastrovascular cavity
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D
Both B and C
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Solution
The correct option is D Both B and C Coelenterates like Hydra have a large and simple body cavity which is called as coelenteron. It is also referred to as the gastrovascular cavity. The mouth opens in this cavity. The cavity is in continuation with the hollow tentacles. The gastro vascular cavity performs the function of both digestion as well as circulation.