What is the correlation coefficient for IQ scores of adopted siblings who have none of their genotype in common?

Which two groups view violations of gender roles most negatively?

a. Young elementary school-aged children and adolescents b. Preschoolers and elementary school-aged children c. Middle-school-aged children and adolescents d. Preschoolers and adults

When do the sympathetic and parasympathetic divisions cooperate, rather than antagonize one another?

a. during sexual activity b. at times of relative calm c. when a fight-or-flight response is required d. following the ingestion of a meal