Why are many contaminants found at higher concentrations in polar bears and people living in Greenland than they are in bears and people living in temperate and tropical areas?
A) Most of Greenland's GDP comes from importing toxic chemicals for disposal deep beneath its ice sheets.
B) The ice sheets in Greenland, which provide both people and polar bears with fresh water, were contaminated as a result of the Chernobyl nuclear accident.
C) Polar bears and people living in Greenland eat penguins, which are naturally high in toxic contaminants.
D) Global atmospheric circulation carries airborne toxins toward the poles, where their deposition exceeds evaporation.
E) There are fewer regulations regarding the release of toxic pollutants in Greenland than in other regions of the world.
Answer: D
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