It is 297 mm.
5milimimeter
20 centimeters
1 meter
9 cm
21 feet
5milimimeter
20 centimeters
The number of pages it has, the number of words it contains, thickness of the book, weight of the book, time it takes to read it, etc.
4inches
Earthworms vary greatly in their length.
300 feet
12mm
About 4 millimeters
1 meter
about 3 meters
9 cm
21 feet