Question 1
Long-lasting pesticides such as DDT
◦ are target-specific.
◦ are the most effective control over pests.
◦ build up in concentration as they pass through a food chain.
◦ break down after the organism that receives the pesticide dies.
◦ are used only for termite control.
Question 2
Man's pollution of public water sources includes
◦ pesticides.
◦ fertilizers.
◦ carcinogenic chemicals.
◦ radioactive materials.
◦ all of these.