Answer:
I am believed to be only one dimensional, and tinier than anything can be, and there are many who say that I am the basis of all that we see. What am I?
I have a tongue, but do not talk. I follow close, but neither run nor walk. Coupled and hitched, but never married. You couldn't bear the load I've carried.
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
What can be filled with empty hands?
What can be underwater, under fire, on fire and taking water all at the same time?
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?