a global scale<>,<>plants$$$a global scale<>, plants and<>other photosynthetic organisms$$$plants<>and<>other photosynthetic organisms$$$plants<>and other photosynthetic organisms have generated<>all$$$other photosynthetic organisms<>have generated<>all$$$other photosynthetic organisms<>have generated all of<>the oxygen$$$other photosynthetic organisms<>have generated all of the oxygen in<>the air$$$all<>of<>the oxygen$$$all<>of the oxygen in<>the air$$$the oxygen<>in<>the air
It is conceivable that in the absence of atmospheric oxygen, and given enough time, other metabolisms could be dominant, but any plant, that is any photosynthetic organism that does develop aerobic metabolism on such a world will outcompete its neighbors.
On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.
On a global scale, plants and other photosynthetic organisms have generated all of what element in the air?