By: GeneCooper
Image: Gene Cooper ⧉
Subject: Komodo Dragon
License: Copyright, All Rights Reserved

Uploaded: 1 Nov 2017
Last Updated: 1 Nov 2017

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Corals are simple animals that secrete skeletons made of calcium carbonate. They are close relatives of sea anemones and jellyfish and are the main reef builders in modern oceans. Corals can be either colonial or solitary. As fossils, corals are found worldwide in sedimentary rocks. Based on these fossils, we know that the corals began their long evolutionary history in the Middle Cambrian, over 510 million years ago. [Source: http://www.kgs.ku.edu/Extension/fossils/coral.html]