Students first color the organisms given to them and cut them out. They then make a branching tree where they decide what physical traits to use to classify the living things given to them. Each time they branch off from one trait they have to decide what two groups to put them in. Once the branching tree is done they use it to create a dichotomous key using the names of the organisms given on the second sheet of the Word document. Students check each others work to make sure the key works.