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Darwin/Science Theory/Mayr: we speak of Darwin's first and second revolution.
1) Acknowledgement of evolution through common descent.
A) Replace supernatural by natural explanation,
B) Replace the linear model with a complex one.
2) Natural selection: refutation of the theory of acquired traits, refutation of mixed inheritance, discovery of the source of genetic diversity (mutation, genetic recombination, diploidy).
Das ist Biologie Heidelberg 1998