Which of the following does not contribute to increased air quality?

a. the clean air act
b. hybrid cars
c. use of cfcs
d. energy-efficient appliances

Name one type of data that h-r diagrams do not show.

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.