Kinship studies show us that heredity is a more important determinant of happiness than money and other social factors. What else have these studies shown us?

Question

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Kinship studies have shown that identical twins separated at birth and raised by other people are similar to their natural parents in some traits, suggesting that genetics play a significant role in determining certain traits or characteristics. Option A is also true, as kinship studies have shown that people's levels of cheerfulness or grumpiness can vary over time and in different situations. Option C, however, is not entirely accurate, as there is evidence for a genetic role in the appearance of some traits, such as hair and eye color.

Kinship Studies Show Us That Heredity Is a More Important