Marco has great difficulty walking due to uncontrollable tremors and shakiness.His doctor told him that this was due to a decreasing amount of a neurotransmitter in his brain.Which of the following neurotransmitters would be likely to cause this difficulty?

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Dopamine is a neurotransmitter that plays a key role in controlling movement and coordination. A decrease in dopamine levels is associated with movement disorders such as Parkinson's disease, which is characterized by tremors, shakiness, and difficulty walking.

Marco Has Great Difficulty Walking Due to Uncontrollable Tremors and Shakiness.His