Why Is the Amount of Nitrogen That Cycles Among Organisms

Why is the amount of nitrogen that cycles among organisms much smaller than the amount in the atmosphere?

A) Nitrogen is not needed by most of Earth's organisms.
B) Nitrogen gas in the atmosphere cannot be used directly by most organisms.
C) Human nitrogen fixation activities cause an increase in the amount of nitrogen gas in the atmosphere.
D) Nitrogen has a sedimentary nutrient cycle.

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