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 answer

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

answer; i believe that the correct answer is(d) nondisjunction during meiosis;