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

Example Input: Temperature and ph level are important in the activity of an enzyme.
Example Output: Temperature and what other environmental factor are important in the activity of an enzyme?

Example Input: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?
Example Output: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?

Example Input: A perfectly inelastic collision reduces internal kinetic energy to the minimum it can have while still conserving momentum.
Example Output:
A perfectly inelastic collision reduces internal kinetic energy to the minimum it can have while still conserving what?