Oh, dude, like, the unit you'd use for the length of the snake would be, um, meters or feet or, like, inches. I mean, unless you're measuring a really tiny snake, then maybe centimeters. But hey, as long as you're not trying to measure it in bananas or something, you should be good to go.
a meter?
meters
I would use centimeters.
miles edit: kilometers in the rest of the world
Any metric unit would do. But it might be easier to pick something smaller than the length of the pencil, like a centimeter, or a millimeter.
The ISO length unit to use would be the cementer.
It's SI unit is meters
I would use centimetres.
I would use inches.
A meter.
The length of an aeroplane would be measured in metres.
You would use the SI unit meter (m) to measure the length of a DVD case.
It would be normal to use either meters or feet, but you can use any unit for length (inches, cm, mm, km, etc.)
miles or kilomiters
You would use meters.
I would use feet
i would use inches