dottiestwins dottiestwins
  • 03-06-2016
  • Biology
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Tim does a study to determine whether or not cigarette smoking decreases speed in track runners

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smarties15
smarties15 smarties15
  • 04-06-2016
Cigarette smoking decreases speed in track runner, due to the fact that their lungs have black spots. Making it harder for them to breathe. And harder to breathe causing slowing in speed.
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