Answer:
You heard me before and then again. Afterward I die, until you call me again. What am I?
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
Dead on the field lie ten soldiers in white killed by one blade yet there was no fight. What are they?
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
You can see it everyday, but cannot touch it at will. What is it?
Give it food and it will live, give it water and it will die.