The amount of oxygen in Earth's atmosphere has gradually grown over the last few billion years.

Name: The amount of oxygen in Earth's atmosphere has gradually grown over the last few billion years.
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The oxygen levels in Earth's atmosphere have increased significantly due to the process of photosynthesis by cyanobacteria and plants, which began around 2.4 billion years ago during the Great Oxidation Event.

The Amount of Oxygen in Earth's Atmosphere Has Gradually Grown