Question

the cenozoic era began about ______ years ago.

a. 1.8 million
b. 200,000
c. 65 million
d. 4.5 billion

Explanation:

The Cenozoic era is a geological time period. From geological knowledge, the Cenozoic era began about 65 million years ago. Option A (1.8 million) is related to the Pleistocene epoch, B (200,000) is related to human evolution timelines, and D (4.5 billion) is the age of the Earth. So the correct option is C.

Answer:

C. 65 million