Which of the following characteristics is associated with all animals that are bilaterally symmetrical at some point in their life cycle?

Question

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Bilaterally symmetrical animals have mesoderm, which gives rise to muscle and other organs. A lack of organs (A) is not a characteristic associated with bilaterally symmetrical animals, nor is a gastrovascular cavity (B) or coelom (C), both of which refer to specific types of body cavities. Cephalization (E) refers to the concentration of sensory structures at the anterior end of the animal, which is often associated with bilaterally symmetrical animals, but not universally so.

Which of the Following Characteristics Is Associated with All Animals