Caffeine, nicotine, amphetamines, and cocaine are members of a class of drugs known as ______

Linda is a clinical psychologist. The clinical program she attended to start her professional practice required her to complete a literature review instead of a dissertation. Linda's advanced degree is most likely a(n):

a. PhD. b. PsyD. c. MD. d. EdD.

According to the article Gimme the Ball concerning the development of object permanence, the apparatus in the main study by Goubet & Clifton which was used by the side-experienced group most resembled an upside down version of the letter:

(a) H (b) E (c) Z (d) Y