It can be, but it's not always exact. The length from your wrist to your elbow is the size of your foot :) try it! it works!
Yes, me and a few others tested it in our science class and it was true for everyone in there.
Your arm span could be greater than your height .. I'm 6ft and mines is 6'4" xD
I think so, thats what Ive heard before..
Thanks Guys i appriciate it.