Jean-Baptiste Pierre Antoine de Monet, Chevalier de la Marck (August 1, 1744 - December 18, 1829), often known simply as Lamarck, was a French naturalist. He was a soldier, biologist, academic, and an early proponent of the idea that evolution occurred and proceeded in accordance with natural laws. His theory of evolution was based on the idea that acquired characteristics are inherited. After 1800 he put forward general ideas on plant and animal species, which he believed were not ""fixed"".
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Jean-Baptiste Lamarck, French Naturalist