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Laddisandhu520 Laddisandhu520
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6 years ago
When a person breathes out, which of the following normally takes place?
 
  A) O2 is exchanged for CO2.
  B) The heart beats faster.
  C) CO2 is expelled.
  D) The pulse rate changes.
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bunique227744bunique227744
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6 years ago
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