Which of the following supports the notion that heredity contributes to differences in body weight?
a) Pima Indians in the U.S. 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.
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