Which of the following is an example of a persistent pollutant?
A. Bacteria in treated sewage sludge that is spread on fields.
B. DDT which is found in soil years after its use but is eventually destroyed by soil bacteria.
C. Organophosphate insecticides that kill insects for several days but do not bioaccumulate in food chains.
D. Carbon monoxide that breaks down after reacting with oxygen.
E. None of these is an example of a persistent pollutant.
Answer: B
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