31. Invertebrates

What is one visible feature that makes it easy to identify sea cucumbers as echinoderms?

Which of the following statements about the phylum Echinodermata is true?

The water vascular system of a sea star functions in __________.

The water vascular system of echinoderms a. functions as a circulatory system that distributes nutrients to body cells b. functions in locomotion and feeding. c. is bilateral in organization, even though the adult animal is not bilaterally symmetrical. d. moves water through the animal's body during filter feeding.

Which of the following combinations of phylum and description is incorrect? a. Echinodermata—bilateral symmetry as a larva, coelomate b. Nematoda—roundworms, pseudocoelomate c. Platyhelminthes—flatworms, gastrovascular cavity, acoelomate d. Porifera—gastrovascular cavity, coelomate