Question

What event marked the end of the Cretaceous Period?

Answer 1

Answer: the great extinction

Explanation: which the dinosaurs died out, except for the birds, of course.

Answer 2

Cretaceous–Paleogene extinction event

Step-by-step explanation:

The Cretaceous–Paleogene extinction event, also known as the Cretaceous–Tertiary extinction, was a sudden mass extinction