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huck4 huck4
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6 years ago
Exercising on a bicycle or treadmill during a stress test stresses the heart and requires more ________ for the heart muscle cells.
 
  a. helium
  b. hydrogen
  c. carbon dioxide
  d. oxygen
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BubbblesBubbbles
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6 years ago
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6 years ago
This site is awesome
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You make an excellent tutor!
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Thanks
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