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

[EX Q]: A penguin must do increase muscle mass before molting.
[EX A]: A penguin must do what before molting?

[EX Q]: Learning to get used to something after being exposed to it for a while is associated with habituation learning.
[EX A]: Learning to get used to something after being exposed to it for a while is associated with what kind of learning?

[EX Q]: We call water that has been used for cleaning, washing, flushing, or manufacturing wastewater.
[EX A]:
What do we call water that has been used for cleaning, washing, flushing, or manufacturing?