Reproduction, sexuality and fertilization
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Multiplication seems to be an essential criterion of life. Living systems do not have an unlimited lifespan because of an internal complexity which is not well understood yet. It seems also that living machinery undergoes something like wastage, which destroys balanced cell functions. Furthermore, only multiplication of well-functioning entities guarantees survival of living units. Since they are easily destroyed by external injury, also, only an increase in total population size permits the colonizing of new areas by dispersal.
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