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

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

[EX Q]: A 50 ml graduated cylinder of the following tools would give the most precise measurement of 15 milliliters of water.
[EX A]: Which of the following tools would give the most precise measurement of 15 milliliters of water?

[EX Q]: In solids, particles can't overcome the force of attraction between them because they lack kinetic energy.
[EX A]:
In solids, particles can't overcome the force of attraction between them because they lack what?