Question
the replacing of methane gas with oxygen gas into the atmosphere for millions of years is known as blank
a the great debate
b the great oxygenation event
c the great methane event
d cyanobacteria
a the great debate
b the great oxygenation event
c the great methane event
d cyanobacteria
Answers
GPT-4o mini
The correct answer is **b the great oxygenation event**. This event refers to the significant increase in Earth's atmospheric oxygen, primarily due to the photosynthetic activity of cyanobacteria, which replaced methane and other gases with oxygen over millions of years.