The correct answer for the above question is D. that the peripheral system includes all the nerves and neurons outside the brain and the spinal cord. The nervous system comprises the central nervous system, consisting of the brain and spinal cord, and the peripheral nervous system, consisting of the cranial, spinal, and peripheral nerves, together with their motor and sensory endings.
Another name for the genetic disorder down syndrome is Trisomy 21.
A maybe sounds abt right sorry if it's wrong.