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
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.
