Regarding iq similarities between parents and adopted children, which findings are most common? a. biological parents do not tend to have much influence on their children's iqs. b. over time, the iqs of adopted children are more similar to their adoptive parents than their biological parents. c. over time, the iqs of adopted children are more similar to their biological parents than their adoptive parents. d. adoptive parents do not tend to have much influence on their children's iqs.