The window of opportunity, during which life in the form of the first cell could have begun, was how long ago?

Name: The window of opportunity, during which life in the form of the first cell could have begun, was how long ago?
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The window of opportunity during which life in the form of the first cell could have begun was approximately 3.5 to 4 billion years ago, which coincides with the period of time when Earth's atmosphere began to accumulate oxygen due to the emergence of photosynthetic organisms.

The Window of Opportunity, During Which Life in the Form