Answer:
What type of house weighs the least?
I am what brings things together. Without me everything you see would be a total mass or debris everywhere. What am I?
In the sun I like to play; in the rain I goes away; walk or run I always follow; in the mud I always wallow.
What has a head and a tail, but no body or legs?
What is made of wood, but can't be sawed?
When is it bad luck to see a black cat?