c8upceTawatkp c8upceTawatkp

04-03-2016
Biology

contestada

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

04-03-2016

b to obtain oxygen
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