TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Sodium-potassium pumps help nerve cells establish a voltage across their plasma membranes.

SOLUTION: Sodium-potassium pumps help nerve cells establish a voltage across their what?

PROBLEM: Cell -> tissue -> organ -> organ system sequence represents the correct levels of organization for multicellular organisms.

SOLUTION: Which sequence represents the correct levels of organization for multicellular organisms?

PROBLEM: A bee will sometimes do a dance to tell other bees in the hive where to find food.

SOLUTION:
A bee will sometimes do a dance to tell other bees in the hive where to find what?