Inches or centimeters.
9 cm
The metric measurement that is the best estimate for the length of a car is typically in meters or centimeters. This allows for a more precise measurement compared to using larger units such as kilometers.
maybe about 2 inches
21 feet
4-5 1/2 meters
An average human arm length will be around 600 mm or 0.6 m
Depends
milimeters
20 inch
4inches
inches or Millimeters.
Using millimeters would be the best option for accurately measuring the length of eggs. It provides a precise and detailed measurement compared to centimeters or inches.