Task: Paraphrasing
Input (English): Question: On a global scale, plants and other photosynthetic organisms have generated all of what element in the air? 
Answer: oxygen. 
Sentence: On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.
Output (English): The air contains oxygen, of which on a global scale, has all been created by plants and other photosynthetic organisms.