We couldn't breathe without our ...... We breathe in oxygen and release carbon dioxide and this organ helps with this constant process.

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We couldn't breathe without our ...... We breathe in oxygen and release carbon dioxide and this organ helps with this constant process. (*) stomach (*) intestines (*) pancreas (*) lungs

This is a companion discussion topic for the original entry at https://english.best/questions/18145,we-couldnt-breathe-without-our-___-we-breathe-in-oxygen-and-release-carbon-dioxide-and-this-organ-helps-with-this-constant-process/