A first rapid increase of oxygen in the atmosphere (the First Great Oxidation Event) occurred about ____ years ago.
A) 4.4 billion
B) 2.4 billion
C) 1 billion
D) 600 million

Question

Quizplus · Accepted Answer

The first rapid increase of oxygen in the atmosphere, also known as the Great Oxygenation Event or the First Great Oxidation Event, occurred approximately 2.4 billion years ago. This was a significant event in Earth's history and led to the evolution of oxygen-dependent life forms.

A First Rapid Increase of Oxygen in the Atmosphere (The