12. Billy has a disorder where the myelin is being stripped from the axons of his neurons. He is losing motor control and having trouble with his sense of vision, hearing, and touch. What disorder may he have?

Multiple sclerosis

Explanation:

Multiple sclerosis (MS) is a chronic, autoimmune and inflammatory disease of as yet unknown cause that characteristically affects the myelin sheath of axons within the Central Nervous System, the degree of destruction of the myelin sheath and axons is highly variable. When myelin is damaged, the messages that travel along the nerve fibers are interrupted, so: messages can be slower, distorted, short-circuited, or not pass at all, resulting in symptoms of the Multiple sclerosis

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.