Question

select the approximate date that the oxygenated atmosphere developed is * 1 point
4.6 billion years ago
2 billion years ago
10 billion years ago
3.4 billion years ago

Explanation:

The oxygen - rich atmosphere on Earth developed approximately 2 billion years ago through the process of photosynthesis by cyanobacteria. 4.6 billion years ago was around the time of Earth's formation, 10 billion years ago is long before Earth existed, and 3.4 billion years ago there was very little free - oxygen in the atmosphere.

Answer:

2 billion years ago