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kturner254 kturner254
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6 years ago
The chest wall expands during breathing because
 
  a. air in the lungs pushes the lungs outwards.
  b. muscle contraction increases lung volume.
  c. the diaphragm pushes the lungs up.
  d. none of the above.
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789-you789-you
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6 years ago
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kturner254 Author
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#2
6 years ago
Thank you for being my superhero!
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