The largest pool of nitrogen is

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The atmosphere is the largest pool of nitrogen, accounting for almost 78% of the total atmospheric gases. Nitrogen is an essential component of living organisms, but the total amount present in all living and dead organisms combined is only a small fraction compared to the amount present in the atmosphere. The oceans also contain a significant amount of nitrogen in the form of various compounds, but it is still much less than the amount present in the atmosphere.

The Largest Pool of Nitrogen Is