Answer:
Sends paper without using the post office.
What is this Mexican dish consisting of a tortilla rolled around a filling, typically of beans or ground or shredded beef?
I am the first you ever saw, what greets you every morning and what goes out in the end.
What has holes on each side, but can still can hold water?
The more you have of me, the less you see. Who am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.