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

Example Input: Wave amplitude and wavelength are two important measures of wave size.
Example Output: Wave amplitude and wavelength are two important measures of what?

Example Input: Fractional crystallization is the separation of compounds on the basis of their solubilities in a given solvent.
Example Output: What is the separation of compounds on the basis of their solubilities in a given solvent?

Example Input: Natural selection evolutionary process has adapted protonephridia to different tasks in different environments.
Example Output:
What evolutionary process has adapted protonephridia to different tasks in different environments?