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

Input: Consider Input: Incubation is when birds keep their eggs warm while the embryos inside develop.

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


Input: Consider Input: Line graphs are especially useful for showing changes over time.

Output: Line graphs are especially useful for showing changes over what?


Input: Consider Input: The element carbon is present in all organic molecules.


Output: What element is present in all organic molecules?