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The Great Dying, also known as the Permian-Triassic Extinction, occurred approximately 252 million years ago and is considered the most severe extinction event in Earth's history. It resulted in the loss of about 90-96% of marine species and 70% of terrestrial vertebrate species. The causes are believed to include massive volcanic eruptions, climate change, ocean anoxia, and possibly asteroid impacts. This event dramatically reshaped biodiversity and ecosystems, paving the way for the rise of dinosaurs in the subsequent Mesozoic era.

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