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The Minimum Amount of Oxygen in the Air Required for a Human

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The minimum amount of oxygen in the air required for a human to survive (unaided) is around 16 percent of the current abundance in Earth's atmosphere.Using the figure below, what is the earliest time in Earth's history that a human could breathe unaided? The minimum amount of oxygen in the air required for a human to survive (unaided) is around 16 percent of the current abundance in Earth's atmosphere.Using the figure below, what is the earliest time in Earth's history that a human could breathe unaided?

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