Virtually all of the nitrogen used in metabolism comes directly from nitrogen fixation.

Name: Virtually all of the nitrogen used in metabolism comes directly from nitrogen fixation.
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Most of the nitrogen used in metabolism comes from the consumption of plants by animals or the consumption of nitrogen-containing compounds already present in the environment, not directly from nitrogen fixation. Nitrogen fixation is primarily important for converting atmospheric nitrogen into forms usable by plants.

Virtually All of the Nitrogen Used in Metabolism Comes Directly