Which of the following observations provides the best evidence that intelligence test scores are influential by environment?
A) Fraternal twins are more similar in their intelligence scores than are ordinary siblings.
B) The intelligence scores of children are positively correlated with those of their parents.
C) Identical twins are more similar in their intelligence scores than are fraternal twins.
D)The intelligence scores of siblings reared together are positively correlated.
E) Different national groups have different average intelligence scores.
Answer: A) Fraternal twins are more similar in their intelligence scores than are ordinary siblings.
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