Summary:
- 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.