Answer:
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
They try to beat me, they try in vain. And when I win, I end the pain.
who do you think you know but sometimes you don't
What goes around and around the wood, but never goes into the wood?
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?