Amoebas, once they have themselves well pulled in two, go their ways-they practice divorce, but no remarriage.
We're at a point in time which is analogous to when single-celled organisms were turning into multi-celled organisms. So we're the amoebas.
Amoebas are quite obviously widely spread protozoans and some of them have been established as causing serious disease in animals and humans. It is also quite well-established that amoebas are important contaminants of tissue cultures used in preparation of live biologicals, vaccines being the most important of them because they are widely injected into small babies and children.
How many amoebas does it take to screw in a light bulb? One, no two! No four!. . . no eight!
As an analogy one can imagine an intelligent amoeba with a good memory. As time progresses the amoeba is constantly splitting, each time the resulting amoebas having the same memories as the parent. Our amoeba hence does not have a life line, but a life tree.