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What is the common name of the group whose members are characterized by exoskeletons and a unique water vascular system?

a. brachiopods
b. medusas
c. echinoderms
d. tunicates

User SomeKoder
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1 Answer

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I believe it is Echinoderms cause that would include star fish which obviously have an exoskeleton for protection but they also have a pretty fancy water vascular system that is used for locomotion, feeding, respiration and excretion.
User GLJ
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