What I Am

Riddle: I am needed to survive, but when am here there is evil and good, when am gone others come in, you don't seek me you die. What I am?

Answer: Money.

Source: https://www.riddles.com/2824

I am needed to survive, but when am here there is evil and good, when am gone others come in, you don't seek me you die. What I am? — what I am by Sebekedi v1.

Riddle: I am needed to survive, but when am here there is evil and good, when am gone others come in, you don't seek me you die. What I am? Answer: Money. — by Sebekedi v2.