Answer:
Voiceless it cries, wingless flutters, toothless bites, mouthless mutters.
What do you fill with empty hands?
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
What gets wetter as it dries?
I can run but not walk. Wherever I go, thought follows close behind.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.