What chemical regulates motor tempo?

Among adolescent girls, _____ meet minimum standards of physical activity

A) more than three quarters B) about two-thirds C) about one half D) fewer than one quarter

Which of the following statements about vocational life in middle adulthood is true?

A) Work life is no longer an important aspect of identity or self-esteem. B) Middle-aged employees have higher rates of absenteeism than younger employees. C) More so than in earlier or later years, people attempt to increase the personal meaning of their vocational lives. D) Middle-aged employees have higher rates of job turnover than younger employees.