Darwin worked on his ideas on natural selection for two decades without publishing them when he received a letter from Alfred Wallace who had independently developed the same hypothesis.
In June 1858, Darwin received a letter from the young Alfred Wallace, who was working in the East Indies, and in this letter Wallace asked Darwin to evaluate a paper and, if he considered it relevant, forward it to Lyell.
With this information, we can conclude that natural selection is the process proposed by Charles Darwin and Alfred Wallace, the two responsible for the theory of evolution by natural selection.
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