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The "dark ocean" - everything that lies below 200 meters - makes up 90 percent of the ocean. Very little is known about the microscopic life in this realm and its critical role in transforming carbon dioxide to cell material, proteins, carbohydrates and lipids. Marine bacteria that live in the dark depths of the ocean play a newly discovered and significant role in the global carbon cycle, according to a new study. [Source: Bigelow Laboratory for Ocean Sciences]
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