Which of these is NOT true about vaccines? a. they simulate a specific immune response
b. they cause memory cells to be produced
c. they contain an antigen of a weakened pathogen
d. it has been proven that there are many possible negative side-effects to being vaccinated

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.