Answer:
Creatures of power, creatures of grade, creatures of beauty, creatures of strength. As for their lives, they set everything's pace. For all things must come to live. Under their emerald embraceย Either in their life or in their death.
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
What has to be broken before it can be used?
What is round as a dishpan, deep as a tub, and still the oceans couldn't fill it up?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
My days are numbered.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?