Although researchers are completely certain that six facial expressions are universal, two other expressions may also be universal, which are

Based on what you learned about the logic of behavioral genetics studies, which evidence would offer the strongest support for the claim that there is a genetic influence on the development of addictive behavior?

a. adopted children have rates of addictive behavior that are similar to that of both their birth parents and their adoptive parents b. there are low concordance rates among monozygotic twins raised apart c. there are higher concordance rates among monozygotic twins raised apart than among dizygotic twins raised together d. there are higher concordance rates among monozygotic twins raised together than among dizygotic twins raised apart

Which of the following is a strength associated with measures that sample behavior with tasks?

a. Children's behavior is seen as it occurs naturally. b. They almost always validly represent real-life behaviors. c. They are convenient to use. d. They assure representative sampling.