Question

which stage of the nitrogen cycle do the arrows in the image represent? choose 1 answer: a nitrogen fixation, in which nitrogen gas is converted into ammonia. b ammonification, in which organic nitrogen is converted into ammonia or ammonium. c denitrification, in which nitrogen gas is released into the atmosphere. d nitrification, in which ammonia is converted into the nitrite ions. image credit

Explanation:

Nitrogen fixation is the process of converting atmospheric nitrogen gas ($N_2$) into ammonia ($NH_3$). Ammonification is the breakdown of organic - nitrogen compounds to ammonia or ammonium. Denitrification is the conversion of nitrates to nitrogen gas. Nitrification is the conversion of ammonia to nitrite and then to nitrate. Without seeing the image, we can only describe the processes. But if the arrows show conversion of nitrogen gas to ammonia, it is nitrogen fixation.

Answer:

A. Nitrogen fixation, in which nitrogen gas is converted into ammonia.