This Classification Dichotomous Key is an important scientific tool for identifying different organisms based on their observable characteristics. Classification Dichotomous keys are a series of statements, each with two options that guide users to the correct identification. In tree identification, for example, a dichotomous key might ask whether the tree has leaves or needles. If the tree has leaves, the key directs the user down one set of questions; if it has hands, the key directs the user down a different set of questions. Classification Dichotomous keys are tools used to identify other organisms based on observable characteristics correctly. The majority of these keys are created in a dichotomous format. Dichotomous means "divided into two parts."