The Fundamental Quantity is independent Physical Quantity that is not possible to express in other Physical Quanitity. It is used as pillars for other quantities aka Derived Quantities. In Physics, Length, Mass, Time, Electric Current, Thermodynamic Temperature, etc are examples of Fundamental Quantities.
Length, mass, time are the three fundamental quantities.
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Answer:
The choice of which physical quantities are taken as fundamental is somewhat arbitrary, but the three usually selected are length, time, and mass.