In a study, the independent variable is the thing that you change to see how the change produces different results. In this study, the independent variable would be the use of nicotine.
The answer is C, To save lives, prevent injuries, and protect the health of America's workers.
Begin rescue breaths is your answer :)
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L. Johnson was the president that did the fitness test into the act
D, sodium isn't good, also work out some more