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

[EX Q]: Aqueous solution is used to describe a solution in which water is the solvent.
[EX A]: What term is used to describe a solution in which water is the solvent?

[EX Q]: Sodium-potassium pumps help nerve cells establish a voltage across their plasma membranes.
[EX A]: Sodium-potassium pumps help nerve cells establish a voltage across their what?

[EX Q]: Exemplified by baring teeth, aggressive type of displays are common in the animal kingdom, and sometimes serve as a 'bluff'.
[EX A]:
Exemplified by baring teeth, what type of displays are common in the animal kingdom, and sometimes serve as a 'bluff'?