The End-Ordovician extinction was one of the five major mass extinctions in Earth's history, occurring approximately 445 million years ago. This event is characterized by the loss of about 85% of marine species, primarily affecting life in the oceans, and is believed to have been triggered by significant global cooling and a drop in sea levels. The event highlights the dynamic interplay between climate change and biogeography, influencing the distribution and evolution of species over time.
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