The air we breathe is a mixture of many gases. While we rely on oxygen to survive, it is actually not the most abundant gas in the atmosphere.
Even though there is 78% nitrogen in the air we breathe, our bodies cannot use it directly. We breathe it in and breathe it right back out. We get the nitrogen our bodies need from the food we eat.
The Earth's atmosphere is composed primarily of two gases:
Nitrogen fixation is the process by which certain bacteria (like Rhizobium) convert atmospheric nitrogen gas into usable nitrogen compounds (like nitrates) in the soil, which plants can then absorb.
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