The mass extinction of most dinosaurs occurred rapidly as a result of a single cataclysmic event.

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The mass extinction of most dinosaurs is widely attributed to a rapid, cataclysmic event, most commonly believed to be the impact of a large asteroid or comet approximately 66 million years ago, marking the end of the Cretaceous Period. This event created global environmental changes that led to the extinction of about three-quarters of the Earth's plant and animal species, including most dinosaurs.

The Mass Extinction of Most Dinosaurs Occurred Rapidly as a Result