You convert them into the same unit and compare them.
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The answer depends on the tree and what aspect of it you want to measure. There will obviously be different units for its mass and height. Even in linear measurements, you may wish to use different units for its height and girth.
Lots, but most people use only the Metric System.
They didn't. Metric Units were developed independently of Imperial units. Originally each country, and sometimes different parts of the same country, had different sets of units. The Metric System was invented to solve the confusion of different units used in different parts of France. Gradually other countries adopted Metric and abolished their own units. The British Imperial units were one of the last to be abolished.
imperial system * * * * * The Metric and Imperial systems are alternative systems! The metric system is properly known as the International System of Units, abbreviated, from its French name: Système international d'unités to SI units.
Different units in measurement could be inches, centimeters, kilometers ect.