Every two years, what fraction of seats in the U.S. Senate are up for election?

As early as the late 1980s, states had much more success in negotiating agreements and developing regimes to manage the ozone layer than __________

A) increased levels of whaling B) deforestation C) melting of the polar ice caps D) global warming

Which branch of the federal government is designed to play a key role protecting civil liberties in the United States?

A. legislative B. executive C. judicial