Mathematics and Society - OS X Lion Server

oSome chemicals do a good job of killingmosquitoes, flies and insects that eat crops.Chemicals that do not lose their strength veryfast can wash into streams and collect inbodies of water. There the chemicals arepassed along to plants, to fish that eat theplants and then to animals that eat thosefish.CONCENTRATION OF DDTIN ONE FOOD CHAINWaterBottom mudFairy shrimpCoho salmon,lake troutHerring gullsDDT in partsper million (ppm)0.0000020.0140.4103-699Data from Patterns and Perspectives in Environmental Science, National Science Board1) Why do the gulls have such a high concentration of DDT?2) Fish with the concentration of DDT given in the chart cannot reproduce. If a cohosalmon has a mass of 4.2 kilograms, how many grams of DDT does it have? (Assume aconcentration of 3 ppm.)3) Even penguins in the Antaractic have DDT in their bodies. The concentration is about0.18 parts per million. No one sprays DDT in the Antarctic. Where do the penguinsget it?If a penguin weighs 35 kilograms,how many grams of DDT does it have?4) Some bald eagle eggs have been found to have DDT concentrations from 1.1 to 5.6 ppm.Some osprey eggs have concentrations of 6.5 ppm. Why might osprey eggs have moreDDT? (Hint: What do ospreys eat?)5) Mosquitoes can carry malaria. At one time 3.5 million people died each year frommalaria. In 1966 there were 32% as many deaths from malaria as that. How manypeople died from malaria in 1966?Why had the number of deathsdecreased?209