Greenhouse gases include A. oxygen

B. all of these

C. water vapor

D. nitrogen

Whats the biggest sea in the world?

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

Fossils of glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? check all that apply.