Emma has multiple sclerosis. if you could view her nervous system, you would finda. a lack of neurotransmitters in some neurons. b. areas where the dendrites are severely damaged. c. areas where the myelin sheath has degenerated. d. a reduction in the number of chloride ions in her peripheral nervous system.

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.