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Which of the following events happened first? Earth Day celebrated National Park Service formed World human population reached one billion The term "smog" used for the…

Which of the following events happened first? Earth Day celebrated National Park Service formed World human population reached one billion The term "smog" used for the…
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3 votes
Which of the following events happened first?

Earth Day celebrated

National Park Service formed

World human population reached one billion

The term "smog" used for the first time

United States Clean Water Act passed

asked
User Brisi
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7.5k points

2 Answers

2 votes

The answer is world human population reached one billion.

answered
User Jiri Vlasimsky
by
7.6k points
4 votes
World human population reached one billion
answered
User Fabian Kleiser
by
8.4k points
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