Answer:
This is evolution.
Step-by-step explanation:
Based on the system of Cladistics,some systematists are basing organism classification on the period in which they appear or evolved on earth.Therefore species of organism which evolved first are said to be the early organism, and appear higher in the level of classification,while those that evolved later are lower to these organisms in the evolutionary tree.
Simply put,Evolution refers to the progression of changes in an organism overtime.It is as a result of the ability of species of organism to withstand the selective pressure because of the presence of certain inheritable adaptive traits, compare to other organisms in the population.The organisms with these traits are naturally selected.
Therefore, the species of organism with the ability to evolved due to natural selection,are placed higher in the classification tree, while other organisms which evolved later,thus with lesser resistance to the selection pressure are placed below.
Therefore if these traits is in their DNA ,and are responsible for evolution,then classification based on evolution helps to understand the hierarchy by which different organism species appear.Hence evolution and classification are related.