单项选择题

A．It is very well established
B．It is relatively new
C．It is found in one million homes
D．It is being rapidly expanded
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The adoptees grew up to achieve adult weights that were more similar to their biological parents than their adoptive parents, indicating the influence of a person’s genetic makeup in determining body weight.
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Meaningful studies on this topic are very difficult to perform because they require large populations of subjects and many years of data collection, and because poor health sometimes results in limitations to physical activity.
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