In addition to changes in movement capacities of the body, motivation and opportunities to practice, dynamic systems theorists propose that motor skills depend on
a. a secular trend in physical growth.
b. social factors, such as playing with friends
c. a change in the dominant brain hemisphere.
d. brain maturation.
Answer: d. brain maturation.
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Which of the following policies is most likely to reduce adolescent smoking?
A. a sharp rise in the price of tobacco products B. additional information about the health risks of smoking C. an anti-smoking education campaign in school D. an anti-smoking ad campaign featuring celebrities