Abraham Luchins discovered that people's impressions of others are affected by the _____ and _____ effects

Research on race and ethnicity indicates that

A) DNA variation is greater within races than between races. B) ethnic and racial designations are more pronounced in the U.S. than in European nations. C) ethnic and racial designations have not changed over time. D) DNA variation is greater between races than within races.

To infer babies' emotions as accurately as possible, researchers

A) are best off attending to multiple interacting behavioral cues and seeing how they vary across situations believed to elicit different emotions. B) can exclusively rely on analyzing infants' facial patterns to determine the range of emotions they display at different ages. C) are best off asking parents to describe their infants' feelings because infants cannot describe their own feelings. D) must remember that people around the world do not associate photographs of different facial expressions with emotions in the same way.