Answer:
It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?
I pass before the sun, but make no shadow.
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.
Why did the teacher have to wear sunglasses?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?