Each year, pollution is responsible for roughly ______ deaths worldwide.

During the period of Institutional Revolutionary Party (PRI) dominance, the party's presidential candidate was selected

a. through a primary election process. b. through consultation with the important organizations that represented different segments of Mexican society. c. through a caucus of party leaders. d. through a decision made by the outgoing president. e. by a majority of state governors.

What concept centers upon the conflict inherent in the idea that growth of the world’s population increases geometrically whereas the production of food can only increase arithmetically?

a. carrying capacity b. tragedy of the commons c. Malthusian dilemma d. Maslow’s hierarchy of needs