What significant event occurred approximately 2.0 billion years ago?
Understand the Problem
The question is asking about a significant event that took place around 2 billion years ago in Earth's history. The possible answers suggest different biological and evolutionary milestones.
Answer
The Great Oxidation Event occurred approximately 2 billion years ago.
The Great Oxidation Event, or Great Oxygenation Event, a significant increase in Earth's oxygen levels, occurred approximately 2.0 billion years ago.
Answer for screen readers
The Great Oxidation Event, or Great Oxygenation Event, a significant increase in Earth's oxygen levels, occurred approximately 2.0 billion years ago.
More Information
The Great Oxidation Event was caused by the photosynthetic activity of cyanobacteria. This led to the increase in atmospheric oxygen, profoundly impacting Earth's environment and the evolution of life.
Sources
- Great Oxidation Event - Wikipedia - en.wikipedia.org
- The Great Oxidation Event: How Cyanobacteria Changed Life - asm.org
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