The Miller-Urey experiment demostrated that

Your

energy from lightning might have helped create Earth's firs organic molecules

liposome membranes containing organic molecules preceded true cells

organic molecules first could have come to Earth on a meteorite

iron-sulfide bubbles may have acted as the first cell membranes

Which of the following organisms are capable of self-fertilization? a. plants b. tigers c. humans

Match the following terms and definitions. the transformation of a larva to an adult; occurs only in animals having great differences in form between the larva and adult pupa 2. type of mammal that lays eggs monotreme nymph the part of certain insect life cycles in which the young animal has no wings or reproductive organs the developmental stage between larva and adult in insects undergoing metamorphosis metamorphosis 5. the male gonad which produces sperm testes

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.