In __________, powers are shared by the federal and state governments in a marble-cake fashion

The greenhouse effect occurs when

a. the burning of fossil fuels releases too much carbon dioxide into the air, causing the earth's climate to warm. b. the overuse of water from the Edwards and Ogallala aquifers threatens access to water in the future. c. photosynthesis in plants causes the growth of dangerous algae, threatening the life of fish and other water animals. d. overreliance on wind energy causes the average temperature to rise downwind of the wind farms. e. coal burning plants in Mexico cause air pollution to drift into Texas.

In order to test the effects of the 1988 heat wave on worker productivity, 48 machinists were randomly assigned to two groups of 24 machinists each

Each group was tested at a different room temperature (cool and hot) using dependent measures of number of parts produced and accuracy. What type of design does this study represent? A) a single-group, pretest-posttest design B) a Solomon four-group design C) a multilevel, completely randomized, between-subjects design D) a randomized, posttest-only, control-group design