Scientists evaluating the Cretaceous mass extinction have concluded that

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Scientists have concluded that the asteroid impact was likely the triggering event for the Cretaceous mass extinction. This impact caused worldwide environmental changes that led to the extinction of the dinosaurs and many other species. While ecological factors may have played a role in the extinctions, they were likely secondary to the impact event. Climate change was also involved, as the impact caused massive forest fires and a "nuclear winter" that led to global cooling.

Scientists Evaluating the Cretaceous Mass Extinction Have Concluded That