Charles has been thinking about a friend who told him she has been diagnosed with multiple sclerosis. Charles knows from psychology class that multiple sclerosis causes damage to , which can lead to fatigue, trouble with vision, and cognitive disabilities.

myelin protective sheath that covers the nerve fibers (myelination)

Explanation:

Multiple sclerosis (MS) is a potentially disabling disease of the brain and spinal cord (central nervous system). In MS , the immune system attacks the protective sheath (myelin) that covers nerve fibers and causes communication problems between your brain and the rest of your body.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.