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1.  DDT usage has serious environmental concerns and its use has been banned in many countries.  However, its low cost and effectiveness against mosquitos which can transmit diseases like malaria and dengue fever makes it of great importance in the health of citizens of poorer countries.  Review the history and impact of DDT and recommend whether it should be allowed under all circumstances, under no circumstances, or only with specified limitations.

2.  What ara some of the key differences between the study of toxicology in the laboratory and the study of toxic substances in an environmental setting?  Which type of study is more challenging?  Why?


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