In the argument over migration policy, some argue that restricting migration restricts the free market, while others argue that with open migration come security risks. This demonstrates the impact of ______ on migration.

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.

Of what event did Thomas Jefferson say, "A little rebellion now and then is a good thing. It is a medicine necessary for the sound health of government."

a. the adoption of the Bill of Rights b. the American Revolution c. the Boston Tea Party d. Shays's Rebellion e. None of the above