Answer:
What has fingers and a thumb but no hand?
I occur twice in eternity. And I'm always within sight.
What is yours but only used by others?
The main difference between us and zombies
There's one in every deck of cards and in a famous movie
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?