about 3 meters
4inches
Earthworms vary greatly in their length.
300 feet
12mm
About 4 millimeters
1 meter
9 cm
21 feet
2 centimeters
About 20 to 40
There is no standard measure. The monitor that I am using now is 71 cm long. Also, like TV screens, the size of a monitor is the length of its diagonal.
9ft.