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

Input: Consider Input: Molar masses can be used to determine the mass of a quantity of material.

Output: What can be used to determine the mass of a quantity of material?


Input: Consider Input: Light retains its original color under water because frequency remains the same when light is refracted.

Output: Light retains its original color under water because what remains the same when light is refracted?


Input: Consider Input: Animals that defend their area are generally known as territorial.
Output: Animals that defend their area are generally known as what kinds of animals?