environmental science

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https://session.masteringenvironmentalscience.com/myct/courseHome?start=1 https://www.masteringenvironmentalscience.com/site/login.html go on this webstide and do the questions from chapter 19, 20 and extra credit. you can read the textbook online if you click on STUDYAREA before answering the quetions. Everytime you answer wrong points are deducted

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