The ancient oxygen flood that forever changed life in the oceans

ScienceDaily
Aug 27, 2025, 9:18 am62 pts
Ancient forests may have fueled a deep-sea oxygen boost nearly 390 million years ago, unlocking evolutionary opportunities for jawed fish and larger marine animals. New isotopic evidence shows that this permanent oxygenation marked a turning point in Earth’s history — a reminder of how fragile the ocean’s…

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