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

Input: Consider Input: How much is involved in the reaction does the coefficient in front of an element in a formula indicate.

Output: What does the coefficient in front of an element in a formula indicate?

Input: Consider Input: Macroevolution happens when forces of evolution work over a long period of time.

Output: What happens when forces of evolution work over a long period of time?

Input: Consider Input: Coal is nonrenewable, and the sun is renewable is how coal and the sun compare as sources of energy.
Output: How do coal and the sun compare as sources of energy?