The Cenozoic era began about _______ years ago.

Question

Quizplus · Accepted Answer

The Cenozoic era began approximately 65 million years ago and is often referred to as the "Age of Mammals." A: 2 million years ago would be the beginning of the Quaternary period, which is part of the Cenozoic era. B: 15 million years ago would be in the middle of the Miocene epoch, which is also part of the Cenozoic era. D: 225 million years ago would be the beginning of the Triassic period, which is part of the Mesozoic era. E: 1 billion years ago would be in the Proterozoic eon, which precedes the Phanerozoic eon containing the Cenozoic era.

The Cenozoic Era Began About _______ Years Ago