What pesticide has been primarily used to control mosquito populations?
A) mercury
B) DDT
C) lead
D) synthetic estrogens
E) PCB
B
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Inuit people who live in the Arctic tundra have high levels of DDT in their bodies, but live and work far from areas of industrial pollution. They eat seals and fish; seals eat fish. Which mechanism accounts for the high concentrations of DDT?
A. biological magnification B. optical magnification C. drinking Groundwater D. absorption through skin
On average, the atmosphere absorbs roughly this percentage of the solar radiation that reaches the top of the atmosphere:
A) 5 percent. B) 14 percent. C) 25 percent. D) 50 percent.
The causes of the sixth mass extinction include all of the following except ________
A) invasive species B) volcanic eruptions and meteorites C) habitat alteration and destruction D) global climate change
Which of the following is NOT one of the four most populous countries in the Latin American region?
a. Brazil b. Mexico c. Peru d. Argentina e. Columbia