Answer:
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I am an animal and a hair product
I am owned by the poor, the rich do not need me. If you eat me, you will die! What am I?
I am a word. I become longer when the third letter is removed. What am I?
Everyone has me except for a few. You may not be able to identify me but I can always identify you. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?