cnidarians are primitive invertebrates give reason
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Cnidarians are the most primitive "true" multicellular animals (Subkingdom Eumetazoa). ... They possess two of the three germ layers (embryonic tissues) that are typical of all higher animals, having an ectoderm (outer layer) and an endoderm (inner layer), but lacking a mesoderm (middle layer)
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A cnidarians are the simple invertebreates that lives in the water and has a digestive cavity with only one opening.
Example: Jellyfish, corals, hydra are cnidarians
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