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

Ex Input:
Adding the number of protons plus the number of neutrons in an atom decides its approximate mass; atomic number is another word for this value.

Ex Output:
Adding the number of protons plus the number of neutrons in an atom, decides it's approximate mass, what is another word for this value?


Ex Input:
Embryos usually don't survive if they have extra or too few of these genetic units?

Ex Output:
Embryos usually don't survive if they have extra or too few of these genetic units?


Ex Input:
Groundwater primarily comes from precipitation.

Ex Output:

Where does groundwater primarily come from?