Question

What event marks the beginning of Earth's current era?

O A. The emergence of human life
O B. A mass extinction
O C. The disappearance of land bridges
O D. The end of the last ice age

Answer 1

A mass extinction

Step-by-step explanation:

Answer 2

B. We are in the cenzoic era so what previously had happen to cause the life we live today was a huge mass extinction.... hope this helps!!