12,000 Tiny Fossils From a Darwin Warehouse Just Rewrote the Opening Chapter of Complex Life
Rock cores drilled decades ago and stored in Darwin, Australia held more than 12,000 fossils of 1.75-billion-year-old eukaryotes — and they reveal that Earth's first complex life survived only where the ancient sea had oxygen, setting a minimum date for mitochondria and explaining life's billion-year pause.
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