One of the planet’s most active ecosystems is one most people rarely encounter and scientists are only starting to explore. The open ocean contains tiny organisms — phytoplankton — that perform half the photosynthesis on Earth, helping generate oxygen for animals on land. A study by University of Washington oceanographers, published this summer in Nature Microbiology, looks at how photosynthetic microbes and ocean bacteria use sulfur, a plentiful marine nutrient.
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