Classification is the method used by scientists to order living organisms. All species have a unique classification that results in a binomial name. Vertebrates are an example of a classification group. Keys can be used to help to identify individual organisms.he first rank in this system is called a kingdom. There are five kingdoms, based upon what an organism's cells are like: 1  animalia (all multicellular animals). 2  plantae (all green plants). 3  fungi (moulds, mushrooms, yeast). 4  prokaryotae (bacteria, blue-green algae).