Nitrogen is found in the highest concentration, making up approximately 78% of the Earth’s atmosphere by volume. This dominance is due to nitrogen’s chemical stability and the fact that it is not easily removed by geological or biological processes. It serves as a fundamental building block for proteins and DNA, though most organisms cannot use it directly from air. ANSWER: (A) Nitrogen
Which gas is found in the highest concentration in the atmosphere? (A) Nitrogen (B) Carbon dioxide (C) Oxygen (D) Hydrogen
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Nitrogen is the most abundant gas in the Earth’s atmosphere, accounting for roughly 78% of the total volume. Following nitrogen, oxygen comprises about 21%, while other gases like argon and carbon dioxide exist in much smaller amounts. Nitrogen’s high concentration is maintained because it is relatively unreactive and does not easily combine with other elements. It plays a critical role in maintaining atmospheric pressure and regulating the Earth’s climate. Although it is the most prevalent gas, it must be “fixed” by bacteria or lightning into forms that plants can absorb, highlighting its importance in global food web.
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