What element makes up 21 percent of the atmosphere?
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Earth's atmosphere is 78%nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor.
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The oxygen makes up 21% of the atmosphere.
The oxygen is the most important component of a human being.
It helps in performing many functions inside the human body including the burning of the food.
The plants help in maintaining this balance as it inhales the carbon dioxide exhaled by us and after the photosynthesis, it emits out the oxygen.
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