Every deliberate action you make, such as pedaling a bike, walking, scratching, or smelling a flower, involves neurons in the nervous system. a) sympathetic
b) somatic
c) parasympathetic
d) autonomic

b. Somatic

Explanation:

The somatic nervous system is one of the divisions of the peripheral nervous system. The somatic nervous system delivers the motor information from the central nervous system to the skeletal muscles only. The skeletal muscles generate the responses which are consciously controlled. Therefore, the somatic nervous system regulates the voluntary movements of the body.

So, the voluntary movements of skeletal muscles such as the movement of limbs during walking, smelling a flower, pedaling, etc. are regulated by the neurons of somatic division.

a. the production of carbon dioxide through the process of photosynthesis

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.