What is the most abundant form of nitrogen in the biosphere?

Name: What is the most abundant form of nitrogen in the biosphere?
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Quizplus · Accepted Answer

Dinitrogen (N2) gas makes up around 78% of the Earth's atmosphere, and it is also the most abundant form of nitrogen in the biosphere. However, despite its abundance, very few organisms can directly use dinitrogen gas. It must be "fixed" into other forms such as ammonia (NH3) or nitrate (NO3-) before it can be utilized by most living organisms.

What Is the Most Abundant Form of Nitrogen in the Biosphere