Where does the exchange of oxygen, nutrients, and wastes occur? . a. in capillaries. b. in arteries. c. in the lungs. d. in the atria

Why may some young adults go through a quarter-life crisis? a. they are entering middle age and feel distressed about growing old. b. they feel insecure about themselves and their future. c. they have been promoted to more secure, better-paying jobs. d. they have developed more stable personal relationships.