djia2er1inhernnasilv djia2er1inhernnasilv

07-03-2017
Biology

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The lungs are the primary organ of the: digestive system respiratory system excretory system nervous system

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baileybaileybailey baileybaileybailey

07-03-2017

That would be the primary organ of the Respiratory system

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winterbeaver winterbeaver

07-03-2017

The respiratory system, they are responsible for respiration (breathing)

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