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He included basic chemicals that were present on Earth before life began: water, methane, ammonia, and hydrogen.

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became internationally known for his heavily disputed theory of continental drift, which he formulated as early as 1912.

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Best known as one of the co-discoverers of the structure of DNA in 1953 with  and Rosalind Franklin

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Wallace developed some of his most important ideas about natural selection during an eight-year expedition to what was then the Dutch East Indies — modern-day Indonesia — to observe wildlife and collect specimens.

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Identified, named, and classified organisms (plants, animals, bacteria, fungi, etc.)

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He suggests that novel creatures are born out of Earth

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Uniformitarianism, a fundamental principle of geology that explains the features of the Earth's crust by means of natural processes over geologic time.

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Darwinism, a theory that states all species of organisms arise and develop through  the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce.