instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Resonance is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule.
answer:
What is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule?


question:
Blood is made up of red blood cells, white blood cells, platelets, and plasma.
answer:
Blood is made up of red blood cells, white blood cells, platelets, and what else?


question:
Difference in charges causes a voltage to exist across the membrane in cells.
answer:

What causes a voltage to exist across the membrane in cells?