Discussion
Nitrogen fixation is a process that requires
Answer: C
Correct answer: both (a) and (b)
Nitrogen fixation needs both. It is enormously expensive in energy - some 16 ATP per N2 reduced - because the triple bond is so strong. And nitrogenase is irreversibly inactivated by oxygen, so the reaction must take place in an anaerobic setting: a heterocyst, a root nodule protected by leghaemoglobin, or an anaerobic habitat.
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