To what extent do you agree with the assumption that “all substances are poisons”? What is human exposure assessment? Explain some of the methods of exposure assessment. Why is epidemiology important to research studies of environmental health? Give reasoning to support your answer.What are some of the important limitations of the epidemiologic approach with respect to the study of environmental health problems? Create a 3- to 4-page Microsoft Word document that includes the answers to the above questions.