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DHC | History, Entertainment & News on Instagram: "Across Earth’s 4.5 billion-year history, five major mass extinctions have erased enormous portions of life, redefining the course of evolution: • Ordovician-Silurian Extinction (≈444 million years ago): About 85% of marine species vanished as severe ice ages caused sea levels to drop and ecosystems to collapse. • Permian-Triassic Extinction (≈252 million years ago): “The Great Dying” The most catastrophic event in Earth’s history, eliminating ~9
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