Question

Where does most of the nitrogen in earths atmosphere come from?

A: fires
B: erosion
C: bacteria
D: the breakdown of carbon dioxide

Answer 1

C: bacteria.

Step-by-step explanation:

This is the only answer that make sense, because nitrogen fixation is carried out by bacterias, algae and human activity. When organisms use it and release it, nitrogen is suffer a breakdown process, traveling as a gas to the atmosphere.

Answer 2

Most of the nitrogen in earths atmosphere comes from bacteria.