<span>The correct answer is D. a viral infection. Viruses are immune to antibiotics and and can't be killed easily, so you treat the symptoms and the body establishes immunity and defeats the weakened virus. That's why once you get things like the measles once, you can never get them again after in your life.</span>
It controls all parts of the body. It receives and interprets messages from all parts of the body and sends out instructions. The three main components of the central nervous system are the brain, spinal cord and neurons.
