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Lamarck La·marck (lə-märk', lä-), Chevalier de Jean Baptiste Pierre Antoine de Monet. 1744-1829.
French naturalist noted for his theories on evolution by adaptative modification and for classifying animals into vertebrates and invertebrates.
French naturalist who introduced the taxonomic distinction between vertebrates and invertebrates. His theory that the acquired characteristics of a species could be inherited by later generations was a forerunner to Charles Darwin's theory of evolution, although it was eventually discredited.