PART A: Which statement identifies the central idea of the text? A. Dopamine in a neurotransmitter than is only present in the brain when it is experiencing unusually high or low activity.
B. People with high levels of dopamine, or who experience spikes, are often happier and healthier people.
C. Several different diseases and mood disorders can be solved by introducing additional dopamine to the brain.
D. Whether or not a person has healthy dopamine levels in their brain can determine the functionality of their movements and stability of their moods.