Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.
Example Output: On a global scale, plants and other photosynthetic organisms have generated all of what element in the air?

Example Input: In paragraph 2, they had been untouched for centuries does the phrase frozen in time suggest about the figures.
Example Output: In paragraph 2, what does the phrase frozen in time suggest about the figures?

Example Input: Most of the gray matter is on the surface of the brain, surrounding white matter.
Example Output:
Most of the gray matter is on the surface of the brain, surrounding what other type of matter?