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  2. But in the mid-1800s, Darwin and the British biologist Alfred Russel Wallace independently conceived of a natural, even observable, way for life to change: a process Darwin called natural selection. The pressure of population growth

  3. How did Alfred Russel Wallace contribute to the theory of evolution by natural selection? Apply Darwin’s theory of evolution by natural selection to a specific case. For example, explain how Galápagos tortoises could have evolved saddle-shaped shells. Why did Darwin’s observations of Galápagos tortoises cause him to wonder how species ...

  4. Aug 15, 2023 · The Mechanism of Natural Selection. Wallace and Darwin both observed similar patterns in other organisms and independently conceived a mechanism to explain how and why such changes could take place. Darwin called this mechanism natural selection. Natural selection, Darwin argued, was an inevitable outcome of three principles that operated in ...

  5. Oct 31, 2023 · Wallace and Darwin observed similar patterns in the variation of organisms and independently developed the same explanation for how such variations could occur over time, a mechanism Darwin called natural selection.

  6. In the mid-nineteenth century, two naturalists, Charles Darwin and Alfred Russel Wallace, independently conceived and described the actual mechanism for evolution. Importantly, each naturalist spent time exploring the natural world on expeditions to the tropics.

  7. The concept, published by Darwin and Alfred Russel Wallace in a joint presentation of papers in 1858, was elaborated in Darwin's influential 1859 book On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life.

  8. Scientists develop theories to explain how the natural world works. Darwin and Wallace collected evidence that helped them to develop the theory of evolution by natural selection. The theory was not widely accepted at first, in part because it did not explain how heritable traits were passed on.