Trisha and her closest friends all live sedentary lifestyles. The sit at desks throughout the workday, then sit and watch screens at home in the evening until they go to bed. Based on the study of Finnish twins described in the text, about ______ of the variation among Trish and her friends in the percentage of body fat reflects genetics.
A) 20%
B) 50%
C) 70%
D) 90%
Correct Answer:
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