Multiple Choice
PCBs (polychlorinated biphenyls) were
A) in greatest use in the early 1960s.
B) are no longer manufactured or used in the U.S.
C) are still entering the environment from previous use.
D) remain in the sediments for unknown periods of time.
E) All of these are correct.
Correct Answer:
Verified
Correct Answer:
Verified
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