A.Classification and evolution are two related fields of biology. 

B.Evolution pertains to how organisms evolve and classification deals with finding out how two species are related to each other. 

C.For example, evolution and fossil evidence point to the fact that Australopithecus afarensis is considered one of our earliest ancestors. 

D.And classification tells us that Australopithecus afarensis belongs to the genus Homo, which is also the same genus as modern humans.