Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by coral reefs. Coral reefs are built by nests of little animals located in marine waters which contain few nutrients. Many reef are developed from hostile coral reefs, which in turn include polyps that gather in teams. The polyps belong to a group of [ ]
http://worldgeographicchannel.com/coral-reef-adventure-under-the-sea-of-egypt-world-history-channel/
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