What will most likely happen if sudden changes in an environment occur and no individuals of a population are able to adapt to the changes? a. the population will increase in size. b. the population will interbreed with other species with beneficial adaptations. c. the population will change its method of reproduction to discourage diversity. d. the population will become extinct.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above

Coal contains energy. a. light b. kinetic c. chemical d. mechanical