. Which of the following statements regarding adoption studies is false? Adopted children show some similarity in IQ scores. Siblings raised together have higher similarities in IQ than children rais

In studies comparing the IQ scores of adopted children raised separately with siblings raised together, adopted children show lower levels of similarity in IQ scores than siblings raised together. For example, in a study by Van Ijzendoorn et al. (1995) which looked at adopted children, siblings and unrelated children, adopted children showed the lowest level of similarity in IQ scores (r=.19) compared to siblings raised together (r=.39) and the unrelated children living in the same household (r=.26).