A 2015 study by the Pew Research Center found that between 2009 and 2014, more legal and illegal immigrants in the United States ____ than migrated to the United States.
A. filed for green cards
B. returned to Mexico
C. found suitable employment
D. migrated to Canada
E. became citizens
Answer: B
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Synergistic effects involving pesticides occur when
A) nonpersistent pesticides are transformed into persistent pesticides. B) pesticide toxicity interacts with other environmental or chemical factors to produce an unexpected outcome. C) one pesticide is used to control numerous different pests. D) beneficial insects or other wildlife become non-target casualties of pesticides.
Ocean pollution from plastic items dumped from ships and garbage barges, and left as litter on beaches, kills up to ____ sea birds each year.
A. 1,000 B. 25,000 C. 100,000 D. 500,000 E. 1,000,000
Electrostatic precipitators or wet scrubbers can be used to reduce ____ pollution.
A. particulate matter B. carbon dioxide (CO2) C. radon-222 D. carbon monoxide (CO) E. formaldehyde
__________ has been the foundation of Uruguay's growing economy.
Fill in the blank(s) with the appropriate word(s).