After the Great Oxidation Event, __________ formed.

Question

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The Great Oxidation Event was the point in Earth's history when oxygen gas began to accumulate in the atmosphere as a result of photosynthesis by cyanobacteria. This led to the formation of the ozonosphere, a layer of ozone in the upper atmosphere that protects life on Earth from harmful UV radiation. While the formation of the oceans and the atmosphere preceded the Great Oxidation Event, the accumulation of oxygen in the atmosphere was a significant development that allowed for the evolution of complex life forms. Terrestrial life also arose much later, after the oceans were formed and conditions on land became favorable for life.

After the Great Oxidation Event, __________ Formed