Question

biogeochemical cycles
1 of 3
points
0
time
11

1. humans fix nitrogen when they make

fertilizer.
gasoline.
nitrogen gas.
bread.

Explanation:

Nitrogen fixation is the process of converting atmospheric nitrogen (\(N_2\)) into a form that plants can use. Fertilizers often contain fixed nitrogen compounds like ammonium (\(NH_4^+\)) or nitrate (\(NO_3^-\)). Gasoline is a hydrocarbon fuel and does not involve nitrogen fixation. Nitrogen gas (\(N_2\)) is the form of nitrogen in the atmosphere that needs to be fixed. Bread is made from grains and does not directly relate to human - made nitrogen fixation.

Answer:

fertilizer.