Nitrogen may be returned from plants and animals back to the soil as leaves, skin , hair and dead bodies.

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Nitrogen is a vital nutrient for plants and animals, and it can be recycled in ecosystems through a process called nitrogen cycling. When plants and animals die or shed their tissues, nitrogen-containing compounds such as amino acids and nucleotides are released into the environment. These organic molecules can be decomposed by microorganisms in the soil, releasing ammonia and other nitrogen compounds that can be taken up by plants as nutrients. Therefore, leaves, skin, hair, and dead bodies can all contribute to the return of nitrogen to the soil.

Nitrogen May Be Returned from Plants and Animals Back to the Soil