French version

A probabilistic interaction model between the environmental evolution and the biological evolution is proposed. Three applications of this model are exposed: 1) the trophic chain and the probabilistic calcium biomineralization factors which account for the five most significant mass extinctions; the same probabilistic calcium factors intervene in " the cambrian explosion "; 2) the iodine cycle on the sphere surface and its probabilistic influence on the encephalisation and hominisation processes and the earth current settlement by Homo sapiens sapiens; 3) the PO2 P.A.L. rate and its influence on the biological and respiratory systems. An optimization principle, probabilistic, of the biological processes, which ensures the organims adaptation, is proposed. In conclusion, the probabilistic model integrates the natural selection finalist concept by interpreting it in the direction of a neutral and probabilistic evolution.

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