The brain, spinal cord , sensory organs, and all the nerves that connect these organs to the rest of the body make up the nervous system. Together, these organs are responsible for the body 's control and contact between its components. The brain and spinal cord form the central nervous system (CNS) control center, where information is assessed and decisions are made. The peripheral nervous system (PNS) sensory nerves and sense organs track conditions within and outside the body, and transmit this information to the CNS. Strong nerves in the PNS carry signals to regulate their functions from the control center to the muscles , glands, and organs.
The best answer is, "A". 'So they can be quickly and easily referenced.' It is important to have formulas separate, just to make sure that they correspond with certain problems, how to use them, etc.
