I believe the answer is Rubato, when composers slightly slow down or speed up the tempo of the music
False. Due to the fact that they are two different decades
A model is a three-dimensional of a person/thing or of a proposed structure.
A mock up is a model or replica of a machine or structure, used for instructional or experimental purposes.
A prototype is a first or preliminary version of a device or vehicle from which other forms are developed.
Plutonium !
and now i have to reach the word limit thing so ahh