Answer:
What is eaten but can also eat?
I cannot be bought, cannot be sold, even if I'm sometimes made of gold. What am I?
The more you take the more you leave behind. What am I?
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
My days are numbered. What am I?
I am your mother's brother's only brother in law. Who am I?