Answer:
What force and strength cannot get through, I with my unique teeth can do. What am I?
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
A dragons tooth in a mortals hand I kill I maim I divide the land.
How do you know if a sniper likes you?