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

Example Input: Over 90% of the energy we use comes originally from the sun.
Example Output: Over 90% of the energy we use comes originally from what?

Example Input: Diffusion process helps absorptive protists absorb food molecules across their cell membranes.
Example Output: Which process helps absorptive protists absorb food molecules across their cell membranes?

Example Input: A metallic bond is the force of attraction between a positive metal ion and valence electrons.
Example Output:
What is the force of attraction between a positive metal ion and valence electrons?