The central nervous system (CNS), which is made up of the brain and the spinal cord, and the peripheral nervous system (PNS), which is comprised of nerves and ganglia (small concentrations of grey matter).
The brain sends messages to the peripheral nerves in the body via the spinal cord, these have control of muscles and internal organs.
A) Helper T cells divide and activate cytotoxic T cells, which destroy the infected cells.
Answer:
economic prosperity
Explanation:
People may decide to pay more for a house in a pleasant environment or live out of town to enjoy a safe, clean environment rather than live in an urban setting. Choices as to where one lives is often limited by the person's income.