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

Ex Input:
Resonance is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule.

Ex Output:
What is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule?


Ex Input:
For to synthesize glycogen purpose does liver use the excess carbohydrate.

Ex Output:
For what purpose does liver use the excess carbohydrate?


Ex Input:
A cell's membrane provides a barrier to keep extracellular materials from mixing with its internal components.

Ex Output:

How does a cell's membrane keep extracellular materials from mixing with it's internal components?