Answer:
Give it food and it will live, give it water and it will die.
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?