Corals like this one in National Marine Sanctuary of American Samoa form the backbone of healthy ocean ecosystems. Coral reefs support more species per unit than any other marine environment, including some 4,000 species of fish! Corals also form the backbone of healthy human communities. They buffer shorelines from wave actions and prevent storm damage, they provide food and recreational opportunities, and even are the source of new medicines. What do corals do for you? (Photo: Greg McFall/NOAA)
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