CLASSIFICATION AND DICHOTOMOUS KEYS Classification—the grouping of things according to characteristics Taxonomy—Science of classifying organisms and assigning each organism a universally accepted name • Binomial Nomenclature—a system in which each species of animal or plant receives a name of two terms: the first identifies the genus to which it belongs and the second the species itself. DICHOTOMOUS KEY Organized set of couples of mutually exclusive characteristics of organisms that can be used to easily identify organism Dichotomous comes from 2 Greek words that mean “divided in two parts” STEPS TO USING DICHOTOMOUS KEY 1. Use picture to identify 2. Start with statement 1A of Key and read statement. 3. If the statement is true, follow instructions at the end. If the statement is false, go onto statement 1B. Follow instructions at end of 1B. STEPS TO USING DICHOTOMOUS KEY 4. Continue to follow the statement according to directions written in the key until you name the object. 5. Do this for each picture, but remember: ALWAYS START AT THE FIRST STATEMENT!!