Evolution is always a matter of at least two stochastic processes, each one acting as “selector” of the other(s). That is, in non-living systems, where no such “selection” is involved, entropy (lack of coherence) steadily increases, as stated in the famous Second Law of Thermodynamics. In living systems, due to stochastic co-selection, negentropy (information) steadily increases. In Schrodinger’s phrase, “Life feeds on negative entropy.” Life is an ordering, selecting, coherence-making process.
