Explain the role or living things such as yourself in the nitrogen cycle

plz i need this for a grade and its due tomorrow

Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. The transformations that nitrogen undergoes as it moves between the atmosphere, the land and living things make up the nitrogen cycle. Many human activities have a significant impact on the nitrogen cycle. Burning fossil fuels, application of nitrogen-based fertilizers, and other activities can dramatically increase the amount of biologically available nitrogen in an ecosystem.

1. is through mitosis2.dna replication