The Navier-Stokes equations are all partial differential equations. What will be the best reason behind this?

The Navier-Stokes equations are all partial differential equations. What will be the best reason behind this? Correct Answer The dependent variables are functions of all of the independent variables

Each dependent variable in the Navier-Stokes equations depends on all of the independent variables. So, partial differentials are used to indicate that the other independent variables should be kept fixed while differentiating.
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