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

Example Input: If two populations do not mate and produce fertile offspring, separate species result.
Example Output: If two populations do not mate and produce fertile offspring, what results?

Example Input: A concave lens is thicker at the edges than it is in the middle.
Example Output: What type of lens is thicker at the edges than it is in the middle?

Example Input: Aminopeptidase catalyzes the hydrolysis of amino acids from the n-terminal end of a protein.
Example Output:
What catalyzes the hydrolysis of amino acids from the n-terminal end of a protein?