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OpenStudy (caleighhk):
Which of the following events happened first? (5 points) Select one: a. Earth Day celebrated b. National Park Service formed c. World human population reached one billion d. The term "smog" used for the first time e. United States Clean Water Act passed
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OpenStudy (blazeryder):
Which one do you think it is? You really just have to think about it and then the answer is pretty obvious.
KjSaif (kjsaif):
sorry for your question :(
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