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Ocean chemistry has strongly shaped the evolution of life and biogeochemical cycles on the Earth. Although it was known that the early oceans (>520 million years ago) were characterized by strong water-column stratification and limited oxidant availability, the detailed chemical structure of early Earth oceans has remained unclear. Recently, researchers in Wuhan have developed a model of the spatial structure of early-Earth ocean chemistry that significantly advances our understanding of how oceanic conditions influenced the evolution of higher life on our 
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