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Charles Darwin and Alfred Russel Wallace's theory explains how evolution occurs. Individuals naturally vary in traits in a population. With limited resources, competition exists in which those better adapted - with beneficial traits suited to the environment - are more likely to obtain resources, survive, reproduce, and pass traits to offspring over successive generations. This natural selection of advantageous traits leads species to evolve over time.

Haeckel's illustration of human evolution

Darwin Day commemorates the birth of naturalists and geologist Charles Darwin in 1809.

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Darwin's finches or Galapagos finches. Darwin, 1845. Journal of researches into the natural history and geology of the countries visited during the voyage of H.M.S. Beagle round the world, under the Command of Capt. Fitz Roy, R.N. 2d edition.

Darwin's Theory of Evolution: The Origin of Species (History) [minutes, 50] on Amazon.com. *FREE* shipping on qualifying offers. Darwin's Theory of Evolution: The Origin of Species (History)

1 NEW YORK STATE LEARNING STANDARDS: Standard 4: The Living Environment: Key Idea 3: Individual organisms and species change over time