The peripheral nervous system contains all nerve cells that are not part of the brain or spinal cord. That's because it is made up of nerves and nervous ganglia. Its main function is to promote the connection of our central nervous system with all parts, organs and tissues of our body. For this reason it is important that it is composed of many nerve cells because it will carry information from the organs to the central nervous system and vice versa.
The decrease is sunlight would affect the plant population because plants use sunlight as energy witch help them live and grow and without plants some animals do not have food to survive the winter
