something is or has

Dichotomous Key   A dichotomous key is a tool that allows the user to identify organisms or things, such as trees, wildflowers, mammals, reptiles, rocks, and fish.   It does this by allowing the user to choose from pairs of descriptions about the organism’s visible characteristics.   "Dichotomous" means "divided into two parts”. Therefore, dichotomous keys always give two choices in each step. Rules When Using a DK 1.  Always start at the top. 2.  Only look for 1 organism at a time. 3.  Read each choice and decide yes or no, then move on. 4.  Follow each step until you are narrowed down to one thing/organism. Example: Type of Plant Example: Type of Plant Diagrams can also be ways to show a Dichotomous Key Rules When Making a DK 1.  Use permanent characteristics that are visible on the thing/organism itself. Don’t use behavioral characteristics. 2.  Be specific~ do not say things like big or small 3.  Make choices positive~ something is or has not something is not or does not have 4.  If possible start each choice in the pair with the same word. 5.  When a series of steps are finished name the thing/
organism.