10-03-2015
Social Studies

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Any potentially harmful substance that humans add to an ecosystem

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HistoryGuy HistoryGuy

10-03-2015

Any potentially harmful substance that humans add to an ecosystem is generally called a pollutant. Although pollutants can form from non-man-made things, humans are the biggest polluters.

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jasonr12316 jasonr12316

10-03-2015

Gas from cars's muffler

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