Jack and Jill are twins. Because he is a boy, Jack's parents encourage him to run. However, they discourage Jill from engaging in athletic activity. As a result, Jack is much faster at running up a hill than Jill. The difference in Jack and Jill's behaviour is best explained by

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Nonshared environmental influences refer to the different experiences that siblings have, even when raised in the same family. In this case, Jack and Jill are treated differently by their parents based on gender, leading to differences in their running abilities.

Jack and Jill Are Twins