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

Input: Consider Input: Together, the muscular and skeletal organs are known as the musculoskeletal system.

Output: Together, the muscular and skeletal organs are known as what?


Input: Consider Input: Plasma membranes encloses and defines the borders of cells.

Output: What encloses and defines the borders of cells?


Input: Consider Input: Digest food was the appendix used for in the past but is no longer needed for.


Output: What was the appendix used for in the past but is no longer needed for?