Abstract
The effects of natural selection as a process in natural populations differs from 'survival of the fittest' as it was formulated by Darwin in his 'Origin of Species'. The environment of a population exists of continuous changing conditions, which are heterogeneous in space. During its life each individual successively meets with differing conditions. During these confrontations the individual may appear to be 'unfit' or 'unlucky' and may die. If it survives it will meet the following conditions to which it is 'tested' anew, a.s.o. Hence, many individuals being less fit under certain conditions will survive and reproduce, because they did not meet a deadly moment. Therefore, being 'fit' only refers to special prevalent conditions. In each generation the individuals thus being 'unfit' will be eliminated together with the 'unlucky' ones. All other individuals will survive and reproduce, notwithstanding their properties.
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