Nitrogen is the main gas in the Earth's atmosphere, making up approximately 78% of the air we breathe. Oxygen, which is essential for the survival of most living organisms, constitutes about 21%. The remaining 1% is composed of other gases, including argon, carbon dioxide, and trace gases. While oxygen is critical for respiration and combustion, nitrogen plays an essential role in sustaining life by being a fundamental component of amino acids and proteins. The nitrogen cycle helps maintain the balance of this gas in the environment.
