In the mid 1700s, Carolus Linnaeus, a Swedish physician and botanist, published several books in which he described thousands of plant and animal species. Linnaeus grouped the species according to their reproductive parts. Linnaeus developed the two-part binomial taxonomy system of categorizing organisms according to genus and species.Linnaeus's work remains valid. It has been combined with the work of Charles Darwin in the field of evolution to form the foundation of modern taxonomy. Darwin's theory of evolution states that all modern species are derived from earlier species and that all organisms, past and present, share a common ancestry. Darwin's theory of evolution, which has become a unifying theme in biology, is the organizing principle of modern taxonomy.
kingdom / phylum / class / order / family / genus / species