The K/T event was the transition of plants from water to land.

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The K/T event, also known as the Cretaceous-Paleogene extinction event, was a mass extinction event that occurred 66 million years ago and resulted in the extinction of dinosaurs and many other species. It was caused by a combination of factors, including an asteroid impact and volcanic activity. The transition of plants from water to land occurred much earlier, during the Devonian period, about 400 million years ago.

The K/T Event Was the Transition of Plants from Water