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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
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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