Which of the following statements regarding cnidarians is true?
A) Cnidarians have three true tissue layers.
B) The digestive and circulatory compartment of cnidarians is called the gastrovascular cavity.
C) The more stationary cnidarian body form, which is cylindrical with a ring of tentacles, is the medusa.
D) Cnidarians are herbivores and can be destructive grazers on seaweeds.
Answer: B
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