Answer:
found at the back of the book.
I am what brings things together. Without me everything you see would be a total mass or debris everywhere. What am I?
I am bought by the yard but worn by the foot. What am I?
I get dirty when wiping things clean. What am I?
I am an odd number. Take away a letter and I become even. What number am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.