groundnut is a source of nitrogen.
Your body is not capable of directly using the nitrogen in air. It is ultimately the source of the nitrogen in the proteins and other nitrogen-containing compounds in your body, but the precursors for these are (mostly) made by nitrogen-fixing bacteria in the soil and then incorporated into molecules by plants. (The "mostly" is because some of the nitrogen used by plants comes from nitrates or ammonia applied as fertilizer.)
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Eutrophication
water
The human body is about 3% Nitrogen
bread
. eutrophication
the nitrogen in its body is released by the action of decomposers
Protein is a macronutrient that we get from food. It is made up of Carbon, Hydrogen, Oxygen, and Nitrogen. Proteins are the body's only source of nitrogen. When we ingest a protein containging food we excrete the nitrogen in our urine; it is called urea.
Since urea is an organic compound, the body has many uses for it. The most important being the use of excreting Nitrogen. It is also used in fertilizers since it is a good source of Nitrogen.
negative nitrogen balance.
Positive nitrogen balance