A mass extinction in which the dinosaurs disappeared from Earth occurred approximately ____ years ago.
A) 6600
B) 66,000
C) 660,000
D) 66,000,000
E) 660,000,000

Name: A mass extinction in which the dinosaurs disappeared from Earth occurred approximately ____ years ago. A) 6600 B) 66,000 C) 660,000 D) 66,000,000 E) 660,000,000
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The mass extinction event that led to the disappearance of dinosaurs occurred approximately 66 million years ago, at the end of the Cretaceous Period.

A Mass Extinction in Which the Dinosaurs Disappeared from Earth