Inches if you are in the US, centimeters or millimeters everywhere else.
A metre.
miles or kilomiters
A metres, for an approximate measure, a centimetre for a more accurate measure.
I would use a centimetre to measure the length of a boy. Not sure what a boy yard is, though.
yards
sorry i press the wrong words the anwer is gram * * * * * A gram is a measure of mass, not of length! I would use a centimetre.
A metre.
Inches
cm
The ISO length unit to use would be the cementer.
I would use feet
You would use meters.
always the meter to measure length. This is an SI (international) unit of measurment, and is the standard international unit of measurment for length.
a cm
Kilometers are a unit of length, used to measure distance.
miles or kilomiters
inch