Answer:
It is something you will never see again.
I'm a green veggie that looks like a tiny tree.
This is a shape and a symbol that we literally cannot live without. What is it?
Old people and owls are said to be this.
Cold head and feetอพ Round as a ballอพ Always turning around itself.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.