Who are cnidarians ?And explain their body cavity, symmetry.
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A cnidarian's body is diploblastic, with two cell layers of the body wall separated by mesoglea, and shows radial symmetry. The body cavity (gastrovascular cavity) is sac-shaped, with one opening acting as both mouth and anus. This opening is surrounded by tentacles bearing thread cells.
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are the members of tthe phylim cnidaria ,common examples include jellyfish sea and sea fans
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