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Another aspect of cnidarians is that all cnidarians have two layers of living tissue. These two layers are always separated by a gelatinous layer called mesoglea. The first layer of living tissue is known as the dermis, and the second layer is know as the gastordermis.
A. Cnidarians have a circulatory system. B. All cnidarians are carnivorous predators. C. All cnidarian life cycles include both polyp and medusa stages.D. They have bilateral symmetry.E. They have a complex nervous system. Add your answer. Source. Submit Cancel.. All cnidarians are carnivorous predators. C. All cnidarian life cycles include both polyp and medusa stages. D. They have bilateral symmetry. E. They have a complex nervous system. Add your answer. Source. Submit Cancel.