query: تنتج النباتات الأكسجين الي يتنفسو البشر، ويمتصوا ثاني أكسيد الكربون الي يخلفو البشر (أي الزفير).
positive: Plants make oxygen which humans breathe, and they take in carbon-dioxide which humans exhale (that is, breathe out).
negative: Plants did not make oxygen which humans breathe, and they take in carbon-dioxide which humans exhale (that is, breathe out).