Differences in the timing of pubertal changes are largely determined by genetic differences when environmental conditions are roughly the same.

The first neurotransmitter discovered was ____

epinephrine a. ?acetylcholine b. ?dopamine c. ?serotonin d. ?epinephrine

Cells that develop into neurons and glia originate in the a. ventricular zone

b. radial glia. c. forebrain. d. spinal cord.