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spent his time poring over scientific theories attempting to explain rock strata and the diversity of fossils. Geological and fossil evidence was presented to him as contributions to Encyclopedia articles, chief among them "Mammoth", "Fossil", and "Ivory Fossil", all of which noted the existence of mammoth bones in Siberia. As a result of this geological and fossil evidence, Diderot believed that species were mutable. Particularly, he argued that organisms metamorphosized over millennia, resulting in species changes. In Diderot's theory of transformationism,

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