The field of epigenetics focuses on how _________.
a. environmental factors influence genetic expression
b. genetic factors influence unconscious motives
c. learning theories affect environmental factors
d. humanistic theories determine DNA
Question 2
By the mid-1950s, the population in American mental hospitals had risen to about ______.
a. 250,000 c. 750,000
b. 500,000 d. 1,000,000