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

Input: Consider Input: An object attached to a spring sliding on a frictionless surface is an uncomplicated type of simple harmonic oscillator.

Output: An object attached to a spring sliding on a frictionless surface is an uncomplicated type of what device?


Input: Consider Input: A desmosome is a cell structure that anchors the ends of cardiac muscle fibers together.

Output: A desmosome is a cell structure that anchors the ends of what fibers together?


Input: Consider Input: Fires, mainly caused by lightning, are a natural disturbance in temperate grasslands.


Output: Fires, mainly caused by what, are a natural disturbance in temperate grasslands?