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In biological terms, the phrase "survival of the fittest" refers to "the theory of evolution by natural selection was proposed by Charles Darwin and Alfred Russel Wallace in 1858. They argued that species with useful adaptations to the environment are more likely to survive and produce progeny than are those with less useful adaptations, thereby increasing the frequency with which useful adaptations occur over the generations," according to the Encyclopedia Britannica. The British philosopher Herbert Spencer actually coined the phrase "survival of the fittest" in the ''Principles of Biology'' in 1864.
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