environmental science

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 17 and 18. you can read the textbook online if you click on areastudy before answering the quetions. you can only answer once.
everytime you get wrong points are deducted

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