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How do cnidarians in the medusa form move
through the water?

A. the gastrovascular cavity fills with water and allows them to float

B. their tentacles spin causing a propeller motion

C. the tentacles move along the ocean floor like feet

D. water is brought into the gastrovascular cavity and then expelled which propels them forward

Answer :

Answer:

Explanation:

The medusa is a free-swimming form; it moves by rhythmic muscular contractions of the bell, providing a slow propulsive action against the water. The other principal body type of the adult cnidarian is the polyp, a stalked, sessile (attached) form.

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