On mental rotation tasks, days and lesbians have been observed to score ___ than heterosexual men and ____ than heterosexual woman.

A researcher who selects a sample of people of varying ages and studies them at one point in time is by definition, using a ______ design

a) cohort design b) longitudinal design c) lifespan design d) cross-sectional design

The idea that people's social behaviors will vary according to the degree of genetic relatedness among interactants is called

a. moral relativism. c. in-group favoritism. b. reciprocal altruism. d. the inclusive-fitness theory.