In the past 40 years, pesticide use has tripled yet pests still cause extensive damage to crops. Why has this increased use of pesticides not been more effective?
A) The pesticides in use today are much less powerful due to government regulations.
B) The pesticides available are no longer suited for the most common types of pests.
C) Increases in ultraviolet radiation and global warming break down pesticides faster.
D) The widespread use of pesticides has resulted in the evolution of pesticide resistant pests.
D
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Which of the following is most permeable?
a. sand b. soil c. gravel d. silt e. clay
The heavily farmed state of Iowa has lost about ____ of its inland wetlands.
A. 29% B. 39% C. 59% D. 79% E. 99%
What is one tactic Russia uses to achieve control over neighboring countries that have displeased Russian leaders? a. It refuses to receive imports from opposing country
b. It closes the Russian border to the opposing country. c. It captures opposing leaders and sends them to prison camps. d. It assassinates opposing leaders. e. It cuts off or raises prices on natural gas to the opposing country.
Which numbered area on this geologic map of North America consists of recently added tectonic terranes?
A. 1, southern Alaska B. 2, continental platform of west-central Canada C. 3, continental shield of eastern Canada D. 4, coastal plain along the Gulf Coast of the U.S.