On a global scale,which of the following processes is responsible for the conversion of around 50% (the highest amount)of nitrogen to its other compounds?

Question

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Biological processes, specifically nitrogen fixation and denitrification, are responsible for the conversion of around 50% of nitrogen to its other compounds on a global scale. Nitrogen fixation is the process by which nitrogen gas (N2) is converted into a usable form for plants and other organisms, while denitrification is the process by which usable nitrogen compounds are converted back into N2 gas. Both of these processes are primarily carried out by bacteria. Burning fossil fuels, lightning, fertilizer production, and volcanic eruptions are all sources and/or processes that can contribute to the nitrogen cycle, but are not responsible for the majority of the conversion of nitrogen to its other compounds.

On a Global Scale,which of the Following Processes Is Responsible