What am I riddles

To you, rude would I never be, Though I flag my tongue for all to see. What am I?

I am something to make you think, I am something to make you know. I am something to which the answer you might never know. What am I?

While I am in air, I am not in oxygen. I am also in water, but not in hydrogen. I am necessary in all animals, but you won't find me in the zoo. Look in all brains and you'll find me there too. What am I?

I go around all the places, cities, towns and villages, but never come inside. What am I?

A name of an animal minus the first three letters plus a flat piece of wood. What am I ?

I eat, I live. I breathe, I live. I drink, I die. What am I?

I weigh almost nothing. I am lighter than air. But even the strongest man in the world cannot lift me. What Am I?

The more you take, the more you leave behind. What am I?

Only one color, but not one size. Stuck at the bottom, yet I easily fly. Present in sun, but not in rain. Doing no harm, and feeling no pain. What Am I?

You have me today, Tomorrow you'll have more. As your time passes, I'm not easy to store. I don't take up space, But I'm only in one place. I am what you saw, But not what you see. What am I?