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

[EX Q]: Eyespots do the cells in the front of a volvox typically develop to help swim towards light.
[EX A]: What do the cells in the front of a volvox typically develop to help swim towards light?

[EX Q]: Antifreeze lowers it the freezing temperature of the water in car radiators.
[EX A]: What does antifreeze do to the freezing temperature of the water in car radiators?

[EX Q]: 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 A]:
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?