Because vitamins are so good for us, it is important that we .

a. obtain them only from the foods we eat
b. be mindful not to take excessive quantities of them
c. take large quantities of them
d. spend lots of money buying mega-vitamin supplements

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.