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Related to Lamarck's theory: Darwin's theory
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They degregate "hair-splitters," and criticize Lamarck's theory of evolution.
According to Lamarck's theory of evolution, species change not because they passively adapt to their world but they seek to master it by willing changes within themselves.
Mendel's research was not rediscovered until early in the twentieth century, and until then, Lamarck's theory was the most common alternative explanation for heredity.