Answer:
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
I am an odd number. Take away a letter and I become even. What number am I?
If you break me, I'll not stop working. If you can touch me, my work is done. What am I?
I am needed for most animals and hardcover books
I need to be taken from you before you can have me.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.