Answer:
I run up and down the stairs without moving. What am I?
I get dirty when wiping things clean. What am I?
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
I keep growing and am practically indestructible. I get eaten, but always come back. I survive cold and lie everywhere. You see me everyday. What am I?
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?