Answer:
What goes up and down but never moves?
What is at the end of a rainbow?
They are two brothers. However much they run, they do not reach each other.
This became a fashion statement in the garden of Eden.
I'm often served as a "rack of ..." I'm often smoked or grilled, with bones in, and slathered in BBQ sauce.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?