Answer:
C.
Explanation:
Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia or related nitrogenous compounds in soil. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms.
Answer:
this represents response to the environment
An organism reacts to changes in its environment. this is called Behavior
Neurological - by nerves
Endocrinological - by blood and secrets