Answer:
What is it that given one, you'll have either two or none?
What body part is pronounced as one letter but written with three, only two different letters are used?
What kind of room doesn't have physical walls?
I start in little but I end in full, you'll find me in half and complete.
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?