Answer:
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
I row quickly with four oars, but never come out from under my own roof. What am I?
What is the edge of earth and bread?
What is deaf, dumb, and blind, but always tells the truth?
I need to be taken before you can have me. What am I?
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.