Answer:
If you drop me, I'm sure to crack. Give me a smile and I'll always smile back. What am I?
What force and strength cannot get through, I with my unique teeth can do. What am I?
I have a head tail but no arms and legs.
What word sounds the same even after you take away four of its five letters?
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
I am the kind of an ant that's good at math. What am I?