Which of the following supports the notion that heredity contributes to differences in body weight?
A ) Pima Indians in the US and Mexico share the same genes, but only those persons who live in a particular environment develop obesity.
B ) Several forms of human obesity involve a deficit in ghrelin production, which can be treated by ghrelin injection.
C ) Twin studies indicate that genes account for 25 percent of the variability in body fat accumulated when people are fed a high-fat diet.
D ) Twin studies indicate that genes account for little of the variability in body fat accumulated when people are fed a high-fat diet.
E ) Adoption studies fail to show a role for heredity in obesity.
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