Answer:
If I have it, I don't share it. If I share it, I don't have it. What is it?
My first is in some but not in all. My second is into but not in tall. My third in little but no in big. My fourth in port but not in pig. My whole is made in nature's way. For clothing, rugs used every day.
Upon me you can tread, though softly under cover. And I will take you places, that you have yet to discover. I'm high, and I'm low, though flat in the middle. And though a joy to the children, adults think of me little.
What weaves webs as they grow?
I grow for a surface, even if you cut me. I continue to grow even after death.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.