Answer:
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
A tower at the root of all confusion.
What pulls you down and never lets go?
Lots of them make up a word, And lots of words are in them. It's easy when you think about it. A while ago we stamped and mailed them.
What never gets any wetter no matter how hard it rains?