Answer:
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
I'm found in socks, scarves and mittens. I'm found in the paws of playful kittens. What am I?
I am an activity involving pins flying in the air.
After you go through a fall, I will take over. All life will stall, or at least grow slower. What am I?
you need thousands of me to create a digital image.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.