Progressionism, the idea that there is a steady, linear advance across species, was advanced by

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Lamarck was the main proponent of progressionism, as he proposed that species progressed towards increasing complexity and perfection over time through the inheritance of acquired characteristics. While some other scientists, such as Erasmus Darwin, also believed in some form of progressionism, Lamarck was the most influential in shaping the idea. Neither Buffon nor Charles Darwin fully supported progressionism.

Progressionism, the Idea That There Is a Steady, Linear Advance