Question

what is the process of turning ammonium into nitrites and nitrates?
○ assimilation
○ ammonification
○ nitrification
○ decomposition

Explanation:

Nitrification is the process by which ammonium ($NH_4^+$) is oxidized first to nitrites ($NO_2^-$) and then to nitrates ($NO_3^-$) by nitrifying bacteria. Assimilation is the uptake of nitrogen - containing compounds by plants. Ammonification is the conversion of organic nitrogen to ammonium. Decomposition is the breakdown of organic matter.

Answer:

C. Nitrification