(B) In jellyfish (phylum $Cnidaria$),the gastrovascular cavity is a central digestive cavity. It opens to the exterior through a single opening called

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(B) In jellyfish (phylum $Cnidaria$),the gastrovascular cavity is a central digestive cavity. It opens to the exterior through a single opening called the $hypostome$. The $hypostome$ is a conical structure that bears the mouth at its apex. Therefore,the correct answer is $hypostome$.