Carolus Linnaeus (a Swedish Scientist) recognized early that we needed to clearly be able to communicate to each the exact organism we were discussing. Not all dogs are the same, just like elephants. Linnaeus created a set of rules for naming system for organisms from bacteria to the blue whale. Linnaeus chose to use Latin words to define names in the scientific system. He found that each organism could be clearly defined in a naming system consisting of seven levels. The naming system starts as general as naming a Kingdom of each organism which defines if the organism is an animal, plant, protest, fungi, bacteria, or prokaryote.
We have several sheets that help students begin to understand how organisms are grouped and sorted.