Multiple Choice
Sea stars and sea urchins operate their tube feet by
A) a water vascular system that regulates water pressure.
B) cilia transporting hemolymph from chamber to chamber.
C) sticky threads leading from the mouth and primitive brain.
D) actin and myosin fibers that slide and give muscle actions to the five arms or "rays."
Correct Answer:
Verified
Correct Answer:
Verified
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