Answered

Which sentence describes the Great Oxidation Event?

A. It increased the population sizes of anaerobic bacteria because there was more oxygen available.
B. It initially led to decreased populations of cyanobacteria because oxygen was toxic to them.
C. It caused free oxygen to move out of the atmosphere and into the ocean.
D. It changed atmospheric oxygen (O2) into carbon dioxide (CO2) and other gases.



Answer :

GinnyAnswer

Final answer:

The Great Oxidation Event, initiated by cyanobacteria, dramatically increased atmospheric oxygen levels, causing significant ecological changes.


Explanation:

The Great Oxidation Event, also known as the Great Oxygenation Event, occurred about 2.5 billion years ago when cyanobacteria started producing oxygen through photosynthesis, leading to a significant rise in atmospheric oxygen levels. This event resulted in a mass extinction of anaerobic organisms but set the stage for the evolution of multicellular life.


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