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Polyp and medusa forms of Cnidarians.

Description
Both (a) polyp and (b) medusa forms have two layers of cells, an outer epidermis (from ectoderm) and an inner layer of gastrodermis (from endoderm). In between is a layer of mesoglea, which is thin in polyps, such as corals, and thick in medusae, such as most jellyfish.
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