Given a statement, generate a question such that the answer is contained in that statement.

Input: Consider Input: Embryo implantation is used in reproduction.

Output: Embryo implantation is used in what?

Input: Consider Input: Mice catch small creatures to eat

Output: Who catch small creatures to eat?

Input: Consider Input: The volume of a thing depends on the mass of the object.
Output: What depends on the volume of a thing?