Sometimes described as a "chemical brother" of GABA (gamma-aminobutyric acid), which amino acid neurotransmitter acts in an excitatory manner?

__________ originate in the bone marrow, mature in the thymus, and attack foreign substances directly

A) T cells B) B cells C) Telomeres D) Antigens

African American children adopted by white middle-class families had

a. higher IQ scores than the African American population. b. higher IQ scores than their adoptive parents. c. lower IQ scores than their adopted siblings. d. lower IQ scores than the African American population.