Which process desscribes nitrogen fixation in the nitrogen cycle?

Nitrogen fixation is the process by which atmospheric nitrogen (N₂) is converted into ammonia (NH₃) or related compounds, making it accessible to living organisms. This process is primarily carried out by certain bacteria, including those in the soil and root nodules of legumes, through biological nitrogen fixation. Additionally, nitrogen can be fixed through abiotic processes, such as lightning or industrial methods. The fixed nitrogen then enters the ecosystem, supporting plant growth and, consequently, the entire food web.