When scientists discuss the great oxygenation event, they are referring to a time when

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The great oxygenation event refers to a time in Earth's history when free oxygen began to accumulate in the atmosphere at more than just trace amounts. This was a result of the evolution of photosynthetic organisms, such as cyanobacteria, that were able to produce oxygen as a byproduct of photosynthesis. This event had a significant impact on the evolution of life on Earth, leading to the development of aerobic organisms that were able to use oxygen for respiration.

When Scientists Discuss the Great Oxygenation Event, They Are Referring