Which of the following is true of members of the phylum Cnidaria?
A) They are not capable of locomotion because they lack true muscle tissue.
B) They are primarily filter feeders.
C) They have either, or both, of two body forms: mobile polyps and sessile medusae.
D) They may use a gastrovascular cavity as a hydrostatic skeleton.
E) They are the simplest organisms with a complete alimentary canal (two openings).

Question

Quizplus · Accepted Answer

Cnidarians use their gastrovascular cavity as a hydrostatic skeleton to aid in movement and support.

Which of the Following Is True of Members of the Phylum