What is the primary function of earth atmosphere a. to trap heat from the sun. b. to shield the planet from harmful radiation. c. to disintegrate space debris before to reaches the surface. d. all of the above.

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d