Comparing Taxonomy: The search for a common ancestor.
Taxonomy describes the system for classifying living organisms. All living species that have been classified by scientist are classified using the follow categories:
Example: The taxonomy of a black bear (Ursus americanus) is:
Example: The taxonomy of a sea lion (Scientific name: Zalophus californianus)
When we compare the taxonomy of a black bear and sea lion, we find that they share a lot in common. They share the same classifications for kingdom, phylum, and order. Their classifications differ at the level of family and genus. The lowest classification they share in common is order. This tells us that both the sea lion and the black bear have a common ancestor at this level.