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Why do sunspots occur darker than the rest of the Sun's surface?
Axon
A long, slender projection of a nerve cell that typically conducts electrical impulses away from the neuron's cell body.
Acetylcholine
A neurotransmitter in the nervous system associated with muscle contraction, arousal, and attention.
Alzheimer Disease
A progressive neurodegenerative disease characterized by memory loss, cognitive decline, and eventual loss of independent function, associated with plaque accumulation and tangles in the brain.
Memory Loss
The inability to remember information or experiences, which can be temporary or permanent.
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