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
Algae have photosynthetic machinery ultimately derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria.
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?