Answer:
Proof you've done your time in school
What is used by man, tossed by trees, everywhere but unseen?
What has 4 fingers and a thumb, but is not living?
A young man wants to have it, but when he has it he no longer wants it. Blade in hand he attacks it And does his best to remove it. Yet he knows that it is all in vain.
What is it that given one, you'll have either two or none?
What never gets any wetter no matter how hard it rains?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?