How Populations Evolve Historical Theories ? Anaximander (~2500 yrs ago) ? Aristotle ? Georges Buffon (1700?s) ? Jean Baptist Lemark (late 1700?s - early1800?s) ? Erasmus Darwin Charles Darwin 18591874 Voyage of the HMS Beagle On the Origin of Species? ? Descent With Modification ? By means of Natural Selection Support for Descent with Modification ? Biogeography ? Fossil Record ? Molecular Biology, Biochemistry, Cell Biology ? Comparative Anatomy ?Biogeography ? Biogeography, the geographic distribution of species ? Darwin noted that Gal?pagos animals resembled species of the South American mainland more than animals on similar but distant islands The study of fossils provides strong evidence for evolution