The central nervous system includes
a. the brain, spinal cord and cranial nerves.
b. only the brain.
c. the brain and the spinal cord.
d. the brain, spinal cord, cranial nerves and spinal nerves

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )