The cause of the mass extinction at the end of the Mesozoic era probably was

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The collision of Earth with a large meteorite, approximately 66 million years ago, is the most widely accepted cause of the mass extinction at the end of the Mesozoic era. This event caused widespread fires, earthquakes, and a major dust cloud that blocked sunlight and altered global climate, leading to the disappearance of many species, including the non-avian dinosaurs.

The Cause of the Mass Extinction at the End of the Mesozoic