The element essential for the synthesis of proteins in living organisms is nitrogen. It is a key component of amino acids, which are the building blocks of proteins. Nitrogen is incorporated into the organic compounds of organisms via the nitrogen cycle, where it is first fixed into a usable form by nitrogen-fixing bacteria in soil and root nodules of plants. Animals obtain nitrogen by consuming plants or other animals. Adequate nitrogen is crucial for growth, repair, and overall health, making it a vital element in biological processes.