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

The size and symmetry of a beetle’s or an elk’s antlers or a grasshopper’s song communicate rather clearly their state of health.
The size and symmetry of a beetle’s or an elk’s antlers or a grasshopper’s song communicate rather clearly their state of what?

Hydrocarbons compounds, which serve as fuels and are used in manufacturing, are called the driving force of western civilization.
What compounds, which serve as fuels and are used in manufacturing, are called the driving force of western civilization?

Changing the shape of an elastic material gives it potential energy.

Changing the shape of an elastic material gives it what type of energy?