Nitrogen fixation a) is the process where nitrogen is converted to a usable form
b) is accomplished by plants when they break down soil.
c) occurs as a result of photosynthesis
d) none of the above

A. is the process where nitrogen is converted to a usable form

Explanation:

Fixation converts nitrogen in the atmosphere into forms that plants can absorb through their root systems. A small amount of nitrogen can be fixed when lightning provides the energy needed for N2 to react with oxygen, producing nitrogen oxide, NO, and nitrogen dioxide, NO2

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explanation:

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