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Coral Reef Fact:

common sea fan (Gorgonia ventalina) photo: Jaro Nemčok

Gorgonians live in colonies whose skeletons are formed from a flexible substance called gorgonin. Measurements of gorgonin & calcite in several long-lived species is useful in studies of climate  and ocean history due to the close link between their growth rates, composition and seasonal and  climatic change.

Fact source: Wikipedia

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