Question

Why is nitrogen fixation necessary?

A. Respiration uses nitrogen that is attached to oxygen.
B. Plant life cannot use nitrogen atoms unless they are fixed into pairs.
C. Most plants use single nitrogen atoms, not N2 molecules.
D. Photosynthesis requires excess nitrogen.

answer : c

Answer 1

C. Most plants use single nitrogen atoms, not N2 molecules.

Step-by-step explanation: