Jean-Baptiste Lamarck proposed a theory of evolution in which changed circumstances affect needs and habits, use and disuse alter structures, and acquired modifications can be transmitted. His account is historically important for its attempt to explain biological transformation through causes, while its proposed transmission mechanism should be distinguished from modern evidence about genetics.[ref]
Figure 1.
Portrait of Jean-Baptiste Lamarck
. Ambroise Tardieu, engraving drawn from life in Paris, 1824; reproduction recorded in the National Library of Medicine historical-image collection. Commons claims public domain in the country of origin and jurisdictions with life-plus-70 terms or shorter. Source usage terms, via Wikimedia Commons. Source.

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