Answer:
Many foods can make me strong but give me water and I won't last long.
Which weighs more? A pound of iron or a pound of feathers?
Sends paper without using the post office.
How many people are dead in a standard grave yard?
What is something you will never see again?
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.