Answer:
When Iām metal or wood, I help you get home. When Iām flesh and Iām blood, In the darkness I roam.
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
Only two backbones and thousands of ribs.
A harvest sown and reaped on the same day in an unplowed field. Which increases without growing, remains whole though it is eaten within and without. Is useless and yet the staple of nations.
What has six faces and twenty-one eyes?
I have two eyes in the front and a lot of eyes on my tail