Question

Alan is an adopted child who lives with three siblings, all biological children of his adoptive parents. Alan's math skills are far better than those of his adoptive parents or his adoptive siblings. This provides evidence that _____.

Answer 1

Some intellectual skills are related to heredity.

Step-by-step explanation:

Some studies have shown that intelligence is related to genetic factors, among other aspects. Most of these studies rely on IQ tests to determine the cause-effect relationship.

In the example, we must assume that Alan is approximately the same age as his brothers; plus, in order to rule out environmental factors, we must also infer that he's spend about the same time with the family.