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.
A
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After appearing to die out for roughly two decades, the party system resurged with the campaign ofÂ
A. Andrew Jackson. B. Henry Clay. C. Martin Van Buren. D. the Anti-Masonic Party. E. the Whigs.
When those below the age of 21 were first allowed to vote in presidential elections, they
A. flocked to the Republican candidates. B. flocked to the Democratic candidates. C. almost uniformly voted for Independent candidates. D. generally voted for Richard Nixon. E. did not flock to any particular party or candidate.