Fortunately for life, oxygen levels in the atmosphere have been stable over Earth's history.

Name: Fortunately for life, oxygen levels in the atmosphere have been stable over Earth's history.
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Oxygen levels in the atmosphere have fluctuated over Earth's history, with periods of low oxygen levels known as "oxygen depletion events" and periods of high oxygen levels known as "oxygenation events." However, despite these fluctuations, oxygen levels have generally remained within a habitable range for life.

Fortunately for Life, Oxygen Levels in the Atmosphere Have Been