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

[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?

[EX Q]: Line graphs are especially useful for showing changes over time.
[EX A]: Line graphs are especially useful for showing changes over what?

[EX Q]: Electron transport is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp.
[EX A]:
What is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp?