Which of the following is true of members of the phylum Cnidaria?
They are not capable of locomotion because they lack true muscle tissue.
They are primarily filter feeders.
They have either or both of two body forms: mobile polyps and sessile medusae.
They may use a gastrovascular cavity as a hydrostatic skeleton.
(D) They may use a gastrovascular cavity as a hydrostatic skeleton.
Explanation:
