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

Example Input: Evolution occurs by natural selection, a process whereby better-adapted members pass along their traits, according to darwin.
Example Output: Evolution occurs by what process whereby better-adapted members pass along their traits, according to darwin?

Example Input: You call the separation of ions that occurs when a solid ionic compound dissolves dissociation.
Example Output: What do you call the separation of ions that occurs when a solid ionic compound dissolves?

Example Input: Sea animals are natural sponges made of.
Example Output:
What are natural sponges made of?