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

Input: Consider Input: Its temperature and ph best determines the health of a lake used as a source of freshwater.

Output: Which best determines the health of a lake used as a source of freshwater?


Input: Consider Input: Very low density is the concentration of gas molecules in the mesosphere.

Output: What is the concentration of gas molecules in the mesosphere?


Input: Consider Input: Humans create different breeds of organisms using artificial selection.
Output: Humans create different breeds of organisms using what kind of selection?