Which of the following are also Variables? A. Levels of Nitrogen B. Air Pollutants C. Levels of Carbon Monoxide D. Year ? E. Births between 1989 and 1993 ? E. Pre-Term Births G. Levels of Ozone H. No other Variables
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Levels of Nitrogen - This is a variable because it represents different levels of nitrogen, which can vary. B. Air Pollutants - This is a variable because it represents different types or levels of air pollutants, which can vary. C. Levels of Carbon Monoxide - Show more…
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