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

Input: Consider Input: Transient pseudopodia are temporary feet that protists have called.

Output: What are temporary feet that protists have called?


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: The frequency of a wave is the reciprocal of the period of the wave.
Output: The frequency of a wave is the reciprocal of what other attribute of the wave?