Cnidarians and ctenophores are similar in that they both have
a. radial symmetry.
b. mesoderm.
c. a digestive tract with two openings.
d. a pseudocoel.
e. nematocysts.
A; Both phyla have members that are radially symmetrical, although ctenophores may be referred to as biradial. Neither has organized mesoderm (choice b), although they do have mesoglea. Cnidarians have a digestive tract with one opening, although ctenophores have anal pores opposite the mouth (choice c). Neither has a coelom (choice d). Cnidarians have nematocysts, ctenophores do not.
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