How are the areas of study - evolution and classification - interlinked ?

Explanation

One can work out the evolutionary relationships of the species by identifying hierarchies of characteristics between them. Similarities among organisms will allow us to group them together. If the characteristics between two species are more common, then they are more closely related and they had a recent common ancestor.
Thus, build up small group of species with recent common ancestors, then super group with more distant common ancestors and so on. By this one can interlink the study of evolution and classification.