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

Example Input: At a convergent plate boundary, when one plate is oceanic, there are large volcanoes.
Example Output: At a convergent plate boundary, when one plate is oceanic, there are large what?

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: Sexual reproduction process is a cause of variation in a species.
Example Output:
Which process is a cause of variation in a species?