Answer:
If you've got me I'm everywhere. If you share me I'm nowhere. What am I?
What force and strength cannot get through, I with my unique teeth can do. What am I?
The shorter I am, the bigger I am. What am I?
u always follow me but I am rarely seen
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
The answer I give is yes, but what I mean is no. What was the question?