Non-biological nitrogen fixation is:

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(C) Non-biological nitrogen fixation occurs through physical processes in the atmosphere.$1$. Electrochemical fixation: During lightning,the high temp

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Both $(a)$ and $(b)$

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(C) Non-biological nitrogen fixation occurs through physical processes in the atmosphere.$1$. Electrochemical fixation: During lightning,the high temperature and electrical discharge cause atmospheric nitrogen $(N_2)$ to react with oxygen $(O_2)$ to form nitrogen oxides.$2$. Photochemical fixation: High-energy solar radiation can also facilitate the reaction between nitrogen and oxygen in the atmosphere.These nitrogen oxides dissolve in rainwater to form nitric acid and nitrous acid,which reach the soil and are converted into nitrates,thus becoming available to plants. Therefore,both electrochemical and photochemical processes contribute to non-biological nitrogen fixation.

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