Answer:
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.
I am bought by the yard but worn by the foot. What am I?
I ask no questions, but receive a lot of answers. What am I?
You throw me away, I find my way back. Traditionally, I'm wooden with an arch in my back. What am I?
The more of me you take, the more I appear behind you. What am I?