What cannot reproduce outside of living organisms?

So they won't become extinct

Viruses are incapable of producing outside of host cells, but whether they can be considered organisms is a topic of debate among biologists. Currently, the most widely accepted view is that viruses...

One of the classification of a living organism is that it must reproduce in some one way or another. This can be either sexually or asexually.

so that life can continue

"Many frogs croak to attract females for breeding." If a frog cannot croak, thus, reproduce, he will not live easily and a long life. In conclusion, his breed or "line" will not live on. |...