Examlex
Which of the following is not a neurotransmitter?
Concentrating
The act of focusing one's attention or mental effort on a specific task or activity.
Forgetful
Characterized by the inability to remember things or to retain information.
African Americans
Refers to citizens or residents of the United States who have total or significant partial ancestry from any of the black racial groups of Africa.
Discrimination
Unjust or prejudicial treatment of different categories of people, especially on the grounds of race, age, or sex.
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