Question

In geologic history, we live in the Cenozoic Era, which began with the extinction of most dinosaurs.
Select one:
a. 66 million years ago
b. 6 billion years ago
c. 12 thousand years ago
d. 2.5 million years ago
e. 100 thousand years ago

Answer 1

The correct answer is:

a. 66 million years ago

The Cenozoic Era began approximately 66 million years ago following the mass extinction event that led to the demise of most dinosaurs.