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

Example Input: Momentum is directly related to both mass and velocity.
Example Output: Momentum is directly related to both mass and?

Example Input: The properties of the alkali metals are similar to each other as expected for elements in the same family.
Example Output: The properties of the alkali metals are similar to each other as expected for elements in the same what?

Example Input: Dispersion is the term for the spacing of individuals within a population.
Example Output:
What is the term for the spacing of individuals within a population?