What is the function of the central nervous system?
a. to gather information
b. to carry a response to glands and muscles
c. to receive stimuli from the environment
d. to process information and form a response

The correct answer would be D. to process information and form a response.

Central nervous system (CNS) is a part of nervous system that includes brain and spinal cord.

The brain is main controlling and processing unit of the body. The brain has four lobes (temporal, occipital, Parietal, and frontal lobe) in which different stimuli are processed and responses are generated.

The spinal cord acts as a connecting link between the brain and the rest of the body with the help of peripheral nervous system.

Together, brain and spinal cord process information and control all the voluntary and involuntary movements of the body.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.