Answer:
I save lives on the ground and in the air. What am I?
What runs around the whole yard without moving?
You throw me away, I find my way back. Traditionally, I'm wooden with an arch in my back. What am I?
What starts with an 'e' and ends with an 'e' but only has one letter?
I am the reaction after enjoying soda.
I'm the source of all emotion but I'm caged in a white prison.