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What is the most abundant gas in the Earth's atmosphere?
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Oxygen
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Hydrogen
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Carbon Dioxide
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Nitrogen
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Nitrogen makes up about 78% of the Earth's atmosphere, more than any other gas. Oxygen, the second most abundant, constitutes about 21%. This composition plays a crucial role in the sustainability of life on Earth, as nitrogen is essential for the synthesis of amino acids, which are the building blocks of proteins.
