The nonavian dinosaurs were one group among many that did not survive the Cretaceous mass extinction.What factor(s) most likely contributed to this event?

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The most widely accepted explanation for the extinction of nonavian dinosaurs is a massive asteroid impact that occurred at the end of the Cretaceous period. This impact led to devastating environmental effects such as a "nuclear winter" scenario, in which dust and debris from the impact blocked sunlight and caused global cooling. This, in turn, caused widespread ecosystem disruptions and the extinction of many groups of organisms, including the nonavian dinosaurs.

The Nonavian Dinosaurs Were One Group Among Many That Did