Because it takes LOADS of feathers to make up 1kg and lead would be such a small amount, it could fit in a purse.
I think the answer is man
If the respiratory membrane is composed of two layers of
stratified squamous epithelium, it will mostly contain numerous cell layers
because it is its composition of having to be a stratified squamous epithelium.
Another thing, the tissue will most likely be a shield for this type of
epithelium will serve as a protection against abrasion of which the respiratory
membrane will be protected of.