Researchers suggest that ________ of the variability in happiness may be the result of heredity.
A) only 25%
B) at least 60%
C) less than 50%
D) at least 50%

Question

Quizplus · Accepted Answer

Studies on identical twins who were separated at birth have shown that their level of happiness is highly correlated with each other, even if they were raised in different environments. This suggests that a significant portion of happiness is genetically influenced, and researchers estimate that at least 50% (or more) of the variability in happiness can be attributed to genetics.

Researchers Suggest That ________ of the Variability in Happiness May