Question

how does evolution helps in classification of organisms

Answer 1

Although our understanding of evolutionary relationships among organisms has greatly improved in the last century, it is by no means complete. Relationships among organisms, and groups of organisms, continues to be revised as new data becomes available. The rate of such revisions has increased in recent years primarily as a result of the huge amount of new molecular data (such as DNA sequences) that has been brought to bear on tests of evolutionary relationships. This means that nearly all taxonomies (systems of nomenclature) based on evolutionary relationships among organisms are being revised, sometimes radically so. Traditional ideas about how organisms are related, and in which groups they belong, often prove inaccurate.