Flexi Says: Linnaeus introduced the classification system that forms the basis of modern classification. Taxa in the Linnaean system include the kingdom, phylum, class, order, family, genus, and species. A clade is a relative concept. How you define a clade depends on which species you are interested in classifying. Small clades can include as few as two species and their common ancestor. The larger clades can include many more species and their common ancestors. A clade is a group of organisms that includes an ancestor and all of its descendants. It is a phylogenetic classification, based on evolutionary relationships.
