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Answer:

In Alzheimer's disease, as neurons are injured and die throughout the brain, and your brain regions begin to shrink, With ALS  motor neurons in your brain and spinal cord break down and die. When this happens, your brain can't send messages to your muscles anymore.

Explanation

ALS is pretty much only motor skills while Alzheimer's is NOT

ElizaP
Because ALS affects the muscular and skeletal system, while Alzheimers affects the brain.
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