Oxygen-poor ‘boring’ ocean challenged evolution of early life

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Biogeochemists have filled in a billion-year gap in our understanding of conditions in the early ocean during a critical time in life's history on Earth. During the period 1.8 to 0.8 billion years ago, oxygen likely remained low in the atmosphere and ocean, with marine life dominated by bacteria. The ocean was oxygen-free and iron-rich in the deepest waters and hydrogen sulfide-containing over limited regions on the ocean margins....
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