. The term _________________ refers to the additional utility provided by one additional unit of consumption.

A study by the Environmental Protection Agency looked at the costs and benefits of the Clean Air Act from 1970 to 1990. This study found that a middle-range estimate of the health and other benefits from cleaner air was $22 trillion. This amount was about__________________than the costs of reducing the pollution.

The largest cattle rancher in a given region will be unable to have a _____________ sufficient numbers of smaller cattle ranchers provide sources of competition.  

Which of these evolutionary paths is the fate of our Sun?

The RR Lyrae stars all have periods of

In terms of dark, smoother maria and cratered highlands, which Jovian moon most resembles the near side of our own?

The surface of Europa is most like the Earth’s

While featureless in visible light, we can see some detail in Venus’ clouds using

Of the jovian planets, which generates the least internal heat?

What is true of Mars?