• Linnaeus classified organisms based on obvious physical traits.
  • After Darwin published his theory of evolution in the 1800s, scientists looked for a way to classify organisms that showed phylogeny.
  • Phylogeny is the evolutionary history of a group of related organisms.
  • It is represented by a phylogenetic tree that shows how species are related to each other through common ancestors.
  • Clades are based on cladistics.
  • This is a method of comparing traits in related species to determine ancestor-descendant relationships.
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