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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.
Cnidarians (such as the Hydra in the adjacentimage) do not possess organs or systems, but they possess a number of significant characteristics of the digestive systems of higher animals. They possess a mouth and a gastrovascular cavity.