The atmosphere present in which of the following times would fail to support the life of a modern mammal?
A) Archaean eon
B) Cambrian period
C) Cenozoic era
D) Mesozoic era

Question

Quizplus · Accepted Answer

During the Archaean eon, the atmosphere was anoxic, meaning it lacked oxygen, which is essential for the survival of modern mammals. Oxygen did not accumulate in the atmosphere until the Great Oxygenation Event, which occurred after the Archaean eon.

The Atmosphere Present in Which of the Following Times Would