Nitrogen plays a vital role in living organisms as an essential component of amino acids, which are the building blocks of proteins. It is also a key element in the structure of nucleic acids (DNA and RNA), necessary for genetic information and cellular processes. Nitrogen is part of the nitrogen cycle, involving nitrogen fixation, nitrification, and denitrification, which transform nitrogen into different usable forms. Ensuring an adequate nitrogen supply is crucial for growth and development in both plants and animals.