instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Molar masses can be used to determine the mass of a quantity of material.
answer:
What can be used to determine the mass of a quantity of material?


question:
When light passes from one medium to another, it changes speed.
answer:
When light passes from one medium to another, it changes what?


question:
Fish hatch into larvae that are different from the adult form of species.
answer:
Fish hatch into larvae that are different from the adult form of?