Work Step by Step
Option a. is incorrect. Chordates belong to phylum Chordata. Option b. is incorrect. Sea stars belong to phylum Echinodermata. Option d. is incorrect. Sea anemones belong to phylum Cnidaria. Option c. is correct. Sponges belong to phylum Porifera, which means "pore-bearers" because sponges have pores or openings on their bodies.