Fossil plankton shells reveal reduced nitrogen fixation in warmer oceans 3 million years ago
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https://phys.org/news/2026-09-fossil-plankton-shells-reveal-nitrogen.html
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Fossil plankton shells reveal reduced nitrogen fixation in warmer oceans 3 million years ago
https://phys.org/news/2026-09-fossil-plankton-shells-reveal-nitrogen.html
Its history has not been looked up yet.