This is a bacteria dichotomous key example. A dichotomous key is a technique used to identify a species by responding to a series of questions based on contrasting traits. It is used by professionals and students to recognize and group objects into distinct categories according to their features. It is the type of classification or identification key that is most frequently used in biology since it makes it easier to identify unidentified organisms. EdrawMax lets you draw a dichotomous key with its ready-to-use templates.