Answer:
I save lives on the ground and in the air
I am made of wood but can't be sawed? What am I?
I am there when you sit, but gone when you stand. What am I?
What starts with the letter “t”, is filled with “t” and ends in “t”?
My seas have no water, my mountains have no rock, and my land has no grass. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.