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61. A national study of U.S. adolescents revealed that physical activity:A. increased until 13 years of age but then declined through 18 years of age.B. in childhood and early adolescence would persist through to adulthood.C. increased until 13 years of age and then remained stable throughout adulthood.D. decreased until 13 years of age and then stabilized to last through 18 years of age.
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