Cnidarian's bodies can take either of two forms.A polyp consists of a sessile stalk with tentacles on one end,whereas a medusa is a free-swimming,bell-shaped,"tentacles-down" body form with a single opening forming the mouth.Which of the following is true of a Cnidarian?

Question

Quizplus · Accepted Answer

Cnidarians have an incomplete digestive tract, with a single opening serving as both the mouth and anus. They do not have cephalization, which is the development of a head with a concentration of nervous tissue. Indirect development involves a larval stage, which is not present in all cnidarians. Therefore, the correct choice is D.

Cnidarian's Bodies Can Take Either of Two Forms