First you need to decide what PROPERTY of the ear you want to measure: its length, its area, its mass, its surface area, etc.
You would use CM or INCHES to measure a knife
Kilometers
100 inches i think
The unit of measurement to measure the thickness of a DVD is typically expressed in millimeters.
You would use the measurement of "miles".
Feet.
a centimeter
A shoe.
You would use CM or INCHES to measure a knife
inches
meters
Kilograms.
inches
Centimeters
Kilograms.
Square footage.
tons