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Charles Darwin receives a paper from Alfred Russel Wallace that includes nearly identical conclusions about evolution as Darwin's own, prompting Darwin to publish his theory.
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Charles Darwin
English naturalist and biologist (1809–1882)
Charles Robert Darwin was an English naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology. His proposition that all species of life have descended from a common ancestor is now generally accepted and considered a fundamental scientific…Source: Wikipedia (CC BY-SA)
Alfred Russel Wallace
English naturalist (1823–1913)
Alfred Russel Wallace was an English naturalist, explorer, geographer, anthropologist, biologist and illustrator. He independently conceived the theory of evolution through natural selection; his 1858 paper on the subject was published that year alongside extracts from Charles…Source: Wikipedia (CC BY-SA)
Evolution
Gradual change in the heritable traits of populations
Evolution is the change in the heritable characteristics of biological populations over successive generations. It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less…Source: Wikipedia (CC BY-SA)