how nitrogen is balanced in air
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Nitrogen is a fundamental component of aminoacids which are the molecular buliding blocks of protein this means that the amount of nitrogen excerted the body is greater than the nitrogen ingested..
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Nitrogen in the air is taken into the ground by lightning, Bacteria in the soil (rhizobium) and fertilizers. The bacteria in the soil convert this atmospheric nitrogen into nitrates, which is then absorbed by the plants during photosynthesis. These plants are then eaten by animals who get the nitrates as nutrition.
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