Which of the following conditions is the result of degeneration of motor neurons in the spinal cord?
a. spina bifida
b. amyotrophic lateral sclerosis
c. myasthenia gravis
d. cerebral palsy
b
Explanation:
a. spina bifida: is a congenital defect in which the walls of two sides of the vertebrae do not close or meet
b. amyotrophic lateral sclerosis: correct
c. myasthenia gravis: autoimmune disease with severe muscular weakness and fatigue
d. cerebral palsy: caused by a lack of oxygen during birth or in fetal development
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