_______ is caused by the replacement of myelin with a hard fibrous tissue.

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Multiple sclerosis is caused by the replacement of myelin, the protective covering of nerve fibers, with scar-like tissue. This leads to disruption of nerve impulses, resulting in various symptoms such as muscle weakness, difficulty with coordination, and cognitive impairment. SIDS is sudden infant death syndrome, Alzheimer's is a progressive brain disorder, and PKU is a metabolic disorder that affects the breakdown of dietary protein.

_______ Is Caused by the Replacement of Myelin with a Hard