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One species of marine alga, Emiliania huxleyi.

Algae Thermometer

One species of marine alga, Emiliania huxleyi, almost exclusively produces lipids called alkenones, which have proven quite useful for scientists tracking the movement of carbon through the oceans. Alkenones preserved in seafloor sediments provide a record of the temperatures of the waters in which they were made.
(Photo by Tim Eglinton, Woods Hole Oceanographic Institution)


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