Answer:
What is pronounced like one letter, written with three letters. And belongs to all animals?
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
What measures out time. Until in time all is smashed to it?
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Some live in me, some live on. And some shave me to stride upon. I rarely leave my native land. Until my death I always stand. High and low I may be found. Both above and below ground.
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?