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Coral For Sale

Coral For Sale

Corals are marine invertebrates in the class Anthozoa of phylum Cnidaria, typically living in compact colonies of many identical individualpolyps. The group includes important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A "group" of coral is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in length, with a set of tentacles surrounding a central mouth opening. An exoskeleton is excreted near the base. A colony creates large skeletons, over many generations, that are characteristic of each species. Individual heads grow by asexual reproduction of polyps. Corals also breed sexually by spawning; polyps of the same species release gametes simultaneously over a period of one to several nights around a full moon. 

Some corals catch small fish and plankton using stinging cells on their tentacles. The majority of most corals obtain their energy and nutrients from photosynthetic unicellular dinoflagellates in the genus Symbiodinium that live within their tissues. These are commonly known as zooxanthellae and corals that contain them are called zooxanthellate corals. These corals require sunlight and grow in clear, shallow water, typically at depths shallower than 60 metres (200 ft). 

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