In one longitudinal study, approximately ________% of friendships formed by tenth-graders were long-lasting

Which of the following does NOT belong to the category of secondary sex characteristics?

a. Growth of pubic hair b. Growth of facial hair c. Hardening of the bones d. Sperm and egg production

An adult is preoccupied with a need to "make his mark" on the world. Which of Erikson's dilemmas (stages) is this adult grappling with?

a. identity versus role confusion b. intimacy versus isolation c. generativity versus stagnation d. ego integrity versus despair