Answer
Echinoderms poses a combination of characteristics found in no other phylum:
(1) A calcareous, spiny endoskeleton of plates or ossicles,
(2) A water-vascular system,
(3) Pedicellariae,
(4) Dermal branchiae,
(5) Basic pentaradial symmetry.
Work Step by Step
(1) A calcareous, spiny endoskeleton of plates or ossicles,
(2) A water-vascular system,
(3) Pedicellariae,
(4) Dermal branchiae,
(5) Basic pentaradial symmetry.
