The significance of the nitrogen cycle lies in its critical role in replenishing nutrients in ecosystems. Nitrogen is essential for the synthesis of proteins and nucleic acids in living organisms. The cycle involves several processes: nitrogen fixation, nitrification, denitrification, and ammonification. Through these processes, nitrogen moves between the atmosphere, soil, and living organisms, ensuring a continuous supply of this vital nutrient. Disruption of the nitrogen cycle can lead to environmental issues such as eutrophication and nutrient imbalances.