Answer:
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
What type of house weighs the least?
I am bought by the yard but worn by the foot
I transfer oxygen from the atmosphere to your blood
I go through a door but never go in, and never come out. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?