Answer:
(i) Body cavity is modified into a peculiar water-driven
tube system (ambulacral) in which the tube feet (podia) is present for locomotion
and exchange of gases.
(ii) Body wall is covered with spiny hard calcareous (calcium carbonate)
plates (ossicles) that form a rigid or flexible endoskeleton.
You need to login to perform this action.
You will be redirected in
3 sec
