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Answer the following questions: 1. Name the 4 categories of Metals and give an example of a metal from each category. 2. Give the possible sources of exposure, modes of entry into the body, Two major health effects and name/describe a disease associated with • Arsenic • Lead • Nickel • mercury 3. Name the metals that are essential for human nutrition 4. Name 3 chemicals that the chapter identified as human carcinogens. Give some examples of accidents/incidents that involved these chemicals. 5. What measures would you take to reduce the number of emergencies that involve hazardous substances? What are the 3 most common substances that produce personal injuries? 6. What is meant by the term “Dirty Bomb?” What would be the main consequences of detonation of a dirty bomb in a large city? 7. Define 3 types of ultraviolet radiation and discuss their health effects. Please, 4 pages (double spaced , APA format) , title page and references page are not included Please include all References in APA format at the end of paper. Thanks