[coldtea]

>Life itself is the leading cause of death.

It only takes a volcano, earthquake, tsunami, viruses (which are not living organisms) and other such events, for life not to be a leading cause of death in a region for a good while.

And let's not mention meteors...

[itiro]

Life -> volcano -> death

? -> volcano -> ?

No life preceding death, so no death.

Volcano and meteors are variables, while life preceding death is a constant.