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"High values of M∞ and low values of Re tend to encourage laminar ﬂow"

Looking at those two statements from the "fundamentals of aerodynamics", I think the fluid velocity alone does not determine whether the fluid will be laminar or turbulent.(high V gives high mach number but also high Reynolds number). Can someone explain why/how the mach number comes into play?

I would also like to know why an adverse pressure gradient favors transition to turbulent flow.

Thank you!