File:Formation of coral.jpg - Wikipedia

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File:Helictites are one of the rarest and strangest formations found in Wind Cave. Bacteria may be responsible for the branching (247cc9e7-93cf-4ee5-bb12-5ba290fd1553).JPG - Wikimedia Commons

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Coral Reef's Formation Stages. Coral reefs began forming some 30…, by Abdis Garcia Cruz

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