The SI (International System of Units), and the Metric System.
The English system and the metric system.
The two systems of measurement include the English system which is based on the foot measurements, and the Metric system based on the Meter as the unit of reference.
Imperial and metric
The two systems of measurement include the English system based on the foot measurements, and the Metric system which is based on the Meter as the standard unit of reference.
metric system and English system
old system of measurement English system of measurement
The MKS-ISO metric system and the CGS-ISO metric system. The American, Imperial, or customary units of measurement are not a system at all, they are an accumulation of antique units.
Weight and Volume
two units of measurements are MKS and CGS systems
The answers are:Metric system and English system
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Those two nations are both Liberia, Myanmar, and the USA.