<span>It is important to study healthy individuals and individuals who have had injury to the cerebral cortex. You can compare healthy individuals (control group) to the people who have had damage to the brain. Studying people with damage to the brain can help us draw conclusions if there are any negative effects on mood or personality.</span>
C. Upward; downward. As the hot rock rises, cooler rock flows downward to take its place next to the core, where it is heated and becomes buoyant enough to rise again later