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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.
The characteristics of cnidarians are that they have claws, hard exoskeleton, and reproduce sexually. ----- That answer is just silly. The phylum, cnidaria, includes hydras, jellyfish, sea anemones, and corals.