Red and his friends are construction workers. After work, they work out intensively at the gym. Most either jog or cycle in addition to these activities. Based on the study of Finnish twins described in the text, about ______ of the variation among Red and his friends in the percentage of body fat reflects genetics.
a. 20%
b. 50%
c. 70%
d. 90%
Ans: A
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A) Pavlov's and Skinner's work on classical and operant conditioning. B) Piaget's original research in cognitive development. C) Darwin's theory of evolution and the concept of natural selection. D) Freud's stage theory of psychosexual development.
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A major reason that the public initially distrusted behavioral treatment methods was the assumption that human behavior is
A. motivated by unconscious urges. B. influenced by genetics. C. shaped by consequences. D. relatively simple.