Coral |
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Limestone skeletons of anthozoa, i.e. polyps from the cindaria branch. Some corals grow a limestone skeleton underneath, which pushes the polyps upwards and thus gives birth to coral islands. Red coral Mediterranean corals (from the Algerian and Tunisian coasts) are much appreciated in jewel production. Gorgonia show a distribution of nutritional substances over all corals through a system of channels. |
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