WebAug 19, 2009 · The Origin of Oxygen in Earth's Atmosphere. The breathable air we enjoy today originated from tiny organisms, although the details remain lost in geologic time. … WebMar 10, 2024 · The minimum oxygen concentration in the air required for human breathing is 19.5 percent. The human body takes the oxygen breathed in from the lungs and transports it to the other parts of the body …
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