c8upceTawatkp
c8upceTawatkp c8upceTawatkp
  • 04-03-2016
  • Biology
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What is the primary role of the respiratory system in living organisms?
a. to make carbon dioxide
b. to obtain oxygen
c. to use up nitrogen
d. to find hydrogen

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allanmcclellon1
allanmcclellon1 allanmcclellon1
  • 04-03-2016
b to obtain oxygen
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