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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 main characteristics of cnidarians are they are invertebrates that use stinging cells to paralyze and capture prey and to defend them selves. They reproduce both sexually and asexually. And some of them live in a colony.