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

Example Input: Ecological pyramids can demonstrate the decrease in energy, biomass or numbers within an ecosystem.
Example Output: What can demonstrate the decrease in energy, biomass or numbers within an ecosystem?

Example Input: Solid is characterized by molecules with minimal movement and strong forces between them.
Example Output: Which state of matter is characterized by molecules with minimal movement and strong forces between them?

Example Input: Ethers are composed of an oxygen atom that forms single bonds with two carbon atoms.
Example Output:
What are composed of an oxygen atom that forms single bonds with two carbon atoms?