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

[Q]: If the amount of force of that is applied is increased, it is easier happens to the work that a machine is producing.
[A]: If the amount of force of that is applied is increased, what happens to the work that a machine is producing?


[Q]: Negative growth rate results when birth rates fall even lower than death rates.
[A]: What results when birth rates fall even lower than death rates?


[Q]: Lymph vessels are like blood vessels, except they move lymph instead of blood.
[A]:
Lymph vessels are like blood vessels, except they move what instead of blood?