By contracting, muscles pull on bones and allow the body to move.
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What happens to the brain is the brain starts to adjust to the dopamine. And because of that the neurons will begin to make less dopamine. And less dopamine will signalise in the brain.
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Explanation:
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A) The discovery of HIV. They believe that the chimpanzee version of the immunodeficiency virus (called simian immunodeficiency virus, or SIV) most likely was transmitted to humans and mutated into HIV when humans hunted these chimpanzees for meat and came into contact with their infected blood.
