Answer:
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
In my life I must bare, my bloodline I must share. What am I?
My teeth are sharp my back is straight to cut things up it is my fate.
There is one in every corner and two in every room.
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.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?