If we were to study the shyness of adopted children and find that they resemble both their adoptive parents (r = +.40) and their birth parents (r = +.40) on this attribute, we might conclude that

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The resemblance of adopted children to both their adoptive parents and their birth parents in terms of shyness, with a correlation coefficient of +.40 in both cases, suggests that both genetic factors (from the birth parents) and environmental factors (from the adoptive parents) play a role in the development of shyness. This supports the idea that shared environment (the environment provided by the adoptive parents) has a meaningful impact on the development of shyness.

If We Were to Study the Shyness of adopted children