__________is produced largely by neurons in the brain stem and acts both as a neurotransmitter and as a hormone

Robin is working as a student teacher while she finishes her degree in education. Each day she has a portion of the class time where she is in charge, and the teacher who serves as her mentor observes her,

takes notes, and offers her constructive feedback on how to improve her work. This "mentor/apprentice" model of learning is most similar to __________'s theory of cognitive development. a. Erik Erikson's b. Carl Jung's c. Jean Piaget's d. Lev Vygotsky's

According to a recent nationwide study by the American Psychological Association, _______percent of Americans polled reported that their level of stress had increased during the preceding five years (American Psychological Association, 2007a, 2007b, 2010).

a. 18 b. 50 c. 68 d. 93