The United States currently has about ____________________ invasive species that were accidentally or deliberately introduced
Fill in the blanks with correct word
7,100
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Both Tiberius Gracchus and Gaius Gracchus attempted (and failed) to pass major land reforms by using their elected office as
A) Quaestors B) Aediles C) Plebeian Tribunes D) Consuls
What is the term relating to the lowest elevation to which a stream can erode?
a. base level b. gradient c. grade d. erosion limit e. floodplain
During the 1990s, damaging acid precipitation in the United States occurred predominantly ________
A) in the Northeast B) in western states such as Nevada and California C) in southern states such as Texas and Louisiana D) in the Midwest
The world's remittance economy is
A) insignificant in total dollar amounts transferred. B) restricted only to U.S. remittances. C) is reduced by heavy taxation of immigrants. D) often impossible because banks are expressly prohibited from transferring these electronic funds. E) a half-trillion dollar industry.