Answer:
The more you take the more you leave behind. What am I?
I will disappear every time you say my name. What am I?
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
My teeth are sharp my back is straight to cut things up it is my fate.
What loses its head in the morning but gets it back at night?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.