Ⅱ. Disadvantages of Existent Definitions of Life
Ⅲ. Progress of System Theories
Ⅳ. Probability of Super Orderly Structure
of Living System
Ⅴ. Why Creature Has Super Complex Structure
Ⅵ. The Sufficient and Necessary Conditions of
Life Origin and the Definition of Life
Ⅶ. Artificial Life
2400000. Man's cell divides once per 8-48 hours. If it is assumed 2 days, to reach 102400000 needs 44000 years, which is only a short instant in the evolution process.
What is self-reproduction? It is a special repro- duction.
Definition: If the motivity of reproduction is the function of the model and the process does not need any help from outside complex systems, this kind of reproduction is self-reproduction.
It should be noticed that self-reproduction does need helps from outside systems, which are simpler than itself, but does not need help from outside complex systems.
Self-reproduction formula of macromolecule is:
1 macromolecule + several micromolecules = 2 macromolecules
If more complex reproduction is considered, self- reproduction formula is:
Model + material = model + product (same as model)
There were only micromolecular non-living things and seldom macromolecular non-living things on the original earth before life originated. Once a kind of macromolecule got to have a simplest function of self-reproduction in nature, and it was quite steady in nature condition (breaking speed was quite slower than increasing speed), the number of this kind of structure would possibly increase as index curve to an overwhelming number which is called catastrophe. So this kind of structure would certainly exist steadily for a long period with large quantity. There had been always some of them survival within most kind of disaster. In this way, their special structure could exist continuously, namely their non- equilibrium structure could exist continuously, which means life had originated.
There are mistakes in self-reproduction, especially when the first life was RNA instead of DNA (Smith, & Szathmáry, 1997, p.37-39). But successful self- reproduction with a low speed is also possible to create index increasing, though it needs a long time, say, thousands or millions of years. Such a period of time, however, was only a second in the long river of evolution.
Because the natural selection and variation are always available everywhere, the continuous existing of macro