The significance of the nitrogen cycle to ecosystems lies in its crucial role in converting nitrogen into forms usable by living organisms. Nitrogen is a vital nutrient for plant growth, as it is a component of amino acids, proteins, and nucleic acids. Through the nitrogen cycle, atmospheric nitrogen is fixed by specific bacteria into ammonia, which can then be assimilated by plants. Decomposition and nitrification processes further convert nitrogen into different forms, making it accessible to various organisms. A balanced nitrogen cycle supports healthy ecosystems, enabling biodiversity and enhancing soil fertility.