Based on adoption and twin studies, what do researchers conclude about the influence of genetics and environment on the development of intelligence?
a) Fraternal twins’ IQ correlation is equal to the IQ correlation of biological siblings.
b) Adopted children have IQs closer to that of their adoptive parents.
c) Identical twins have the highest IQ correlation.
d) Adopted siblings have IQs similar to that of their adopted siblings raised in the same home.
Answer: c
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