What catastrophic event has been proposed as the most likely explanation as to why the dinosaurs became extinct at the end of the Cretaceous Period?

Name: What catastrophic event has been proposed as the most likely explanation as to why the dinosaurs became extinct at the end of the Cretaceous Period?
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The Answer of What catastrophic event has been proposed as the most likely explanation as to why the dinosaurs became extinct at the end of the Cretaceous Period?

What Catastrophic Event Has Been Proposed as the Most Likely