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

Example Input: Incubation is when birds keep their eggs warm while the embryos inside develop.
Example Output: What is it called when birds keep their eggs warm while the embryos inside develop?

Example Input: All life is built around the element carbon.
Example Output: What element is all life built around?

Example Input: Smooth muscle regulates air flow in lungs.
Example Output:
Which kind of muscle regulates air flow in lungs?