Give reason: The percentage of oxygen gas does not deplete in nature even if the gas is continuously being used during respiration.
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Explanation:
Oxygen currently makes up about 21 percent of the gases in the planet’s atmosphere, but that level hasn’t been steady over Earth’s history. For the first couple of billion years, there was little oxygen in the atmosphere. Then, about 2.5 billion years ago, oxygen started getting added to the atmosphere by photosynthetic cyanobacteria.
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