What is the role of nitrogen in the atmosphere?

Nitrogen makes up about 78% of the Earth's atmosphere and plays a crucial role in maintaining atmospheric stability. It is an inert gas that helps dilute oxygen and prevent rapid combustion. Additionally, nitrogen is essential for life as it is a key component of amino acids and nucleic acids, though it must be fixed by certain bacteria to be utilized by living organisms. Overall, nitrogen acts as a buffer in the atmosphere, contributing to the overall balance of gases.