Pesticide-resistant insects develop from the widespread use of insecticides because
A) pesticides cause mutations in the insects that make them resistant.
B) pesticides increase the biotic potential of some insects.
C) insects learn to avoid the places where insecticides have been applied.
D) over many generations, the naturally resistant pests survive and increase in number.
D
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A ________ climate is semiarid, but not as dry as a desert—moist enough to sustain grasses and shrubs
A) humid continental B) steppe C) tropical rainy D) marine west coast
Counting tar sands, ________ has the second largest oil reserves in the world.
A. Mexico B. Nigeria C. the United States D. Canada E. Brazil
Argon is the ________ most plentiful gas in the atmosphere
A) single B) second C) third D) fourth E) fifth
A dense layer, often forming in the B horizon under calcification is ________
A) solum B) regolith C) a hardpan D) a latosol E) vadose