1. Which of the following chemicals is a persistent organic pollutant (POP), but is produced naturally (not artificially by humans)? A. DDT (dichloro-diphenyl-trichloro-ethane), produced as an insecticide B. ethyl-mercaptan, produced by skunks C. PCBS (polychlorinated biphenyls), produced for electrical insulation D. aldrin, produced as an insecticide E. dioxins (like 2,4-D), produced as a byproduct of herbicides

1. Which of the following chemicals is a persistent organic pollutant (POP), but is produced naturally (not artificially by humans)? A. DDT (dichloro-diphenyl-trichloro-ethane), produced as an insecticide B. ethyl-mercaptan, produced by skunks C. PCBS (polychlorinated biphenyls), produced for electrical insulation D. aldrin, produced as an insecticide E. dioxins (like 2,4-D), produced as a byproduct of herbicides

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter31: Soil And Plant Nutrition

Section: Chapter Questions

Problem 4RQ: For an element to be regarded as essential, all of the following criteria must be met, except: No...

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