The nitrogen cycle is significant for all living organisms because it facilitates the conversion of atmospheric nitrogen (N2) into bioavailable forms like nitrates and ammonia, which are essential for protein synthesis and overall plant growth. Nitrogen-fixing bacteria play a crucial role in this process, making nitrogen accessible to plants, which in turn support higher trophic levels in the food chain. By maintaining soil fertility and promoting plant health, the nitrogen cycle is integral to agricultural productivity and the sustainability of ecosystems. Disruptions can lead to negative environmental impacts such as eutrophication.