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The ocean floor is in effect a graveyard of all the undersea creatures that have ever lived, but a new study's significance for tracking climate-change lies with the smallest of those creatures-the tiny plankton, inhabitants of the bottommost rungs of the oceanic food chain. The study presents the world's first map of what rests on the oceans' floors-a map that's been updated comprehensively for the first time since the 1970s. [Source: The Wire]
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