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How did Alfred Russel Wallace contribute to the theory of natural selection?

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Marble bust of Aristotle with a beard and draped robe, showing detailed facial features and wavy hair, set against a dark background. — Philosophy of biology Detail of a Roman copy (2nd century bce) of a Greek alabaster portrait bust of Aristotle, c. 325 bce; in the collection of the Roman National Museum.

Alfred Russel Wallace was a British naturalist who independently formulated the theory of evolution by natural selection, paralleling the work of Charles Darwin.123

While conducting research in the Malay Archipelago, Wallace developed his evolutionary ideas and sent a manuscript outlining them to Darwin in 1858. Recognizing the striking similarity to his own research, Darwin consulted colleagues, leading to a joint presentation of their work to the Linnean Society in 1858.45

Although Darwin is credited with developing the theory in greater detail and providing more extensive evidence, Wallace’s independent discovery was a significant contribution to science. Wallace also influenced the terminology of the field; at his urging, later editions of Darwin's On the Origin of Species incorporated the phrase "survival of the fittest," a term coined by Herbert Spencer. Notably, Wallace eventually diverged from Darwin by arguing that natural selection could not account for the higher faculties of human beings, which he believed required direct divine intervention.456