Answer:
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
The 8 of us go forth and not back to protect our king from a foe's attack. What am I?
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
My teeth are sharp my back is straight to cut things up it is my fate.
I am needed for most animals and hardcover books
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.