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

Input: Consider Input: Lipids are available to the body from three sources.

Output: Lipids are available to the body from how many sources?


Input: Consider 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.

Output: 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?


Input: Consider Input: Electrostatic attractions holds ionic and covalent compounds together.
Output: What holds ionic and covalent compounds together?