Born April 15, 1772, Étienne Geoffroy Saint-Hilaire was a French naturalist who theorized an underlying unity of organismal design, and the possibility of species transmutation in time. Developing on the ideas of his colleague Jean-Baptiste Lamarck, Saint-Hilaire gathered evidence in embryology, amassing evidence for his claims through research in comparative anatomy, and paleontology. His ideas anticipated the evo-devo evolutionary concept.
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