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It depends. If it is a metric ruler then they are most likely to be millimetres. On an Imperial ruler the smallest may be sixteenths of an inch.
That refers to the marks - for example, a ruler may be marked with centimeters and millimeters. The centimeter marks are somewhat longer (to distinguish them easily); the millimeter marks are usually the smallest division - the smallest unit that is marked on the scale.
yes a metric ruler and a meter ruler is the same
None. A metric ruler would not show inches, as these are not a metric measurements. It would show millimetres and centimetres.
An english ruler uses inches and feet, and a metric ruler uses centimeters, millimeters, decimeters and meters.