Cnidarians with skeleton made up of calcium carbonate
are
Corals
Jelly fishes
Sea anemones
Sea walnuts
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The stony corals are very common reef builders because they make a robust and white skeleton that tends to be massive. Also included are the brain, lettuce, and mushroom corals, The skeleton is composed of calcium carbonate and is secreted at the base of the polyp.
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Cnidaria (/nɪˈdɛəriə, naɪ-/)[5] is a phylum under kingdom Animalia containing over 11,000 species[6] of aquatic animals found both in freshwater and marine environments, predominantly the latter.
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