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Inspired by evidence that he collected during his expedition on the 'HMS Beagle' and his research regarding selective breeding, Darwin theorized that all species descended from a common ancestor. In his groundbreaking work of evolutionary biology, "On the Origin of Species," he details the scientific theory of evolution, which posits that species evolve over a period of many generations through a process of natural selection.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.