Answer:
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I’ve told you all I cannot tell you more.
I am the kind of soda you must not drink. What am I?
I have branches but no fruit trunk or leaves. What am I?
Men seize me from my home tear apart my flesh drink the sweet blood then cast my skin aside.
I am constantly overlooked by everyone but everyone has me.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.