Learning Objective: Students will learn how to effectively use a dichotomous key. State the differences between a monocotyledon and dicotyledons. Name the 7 characteristics of a living organism.

A dichotomous key is a series of questions which leads to the identification of an item.

Most taxonomic keys are “dichotomous,” (two branches), which is to say they are written with a series of two choices to be made about the anatomy of an animal (or photograph of an animal) you are looking at. Keys are not made to be read from start to finish like a book or a poem. In each numbered series you should read both choices, determine which choice best applies to the specimen you are looking at, then go where the key tells you to go, often skipping other steps in between that don’t apply.

How to use! Dichonomous: 2 branches Branches based on physical characteristics Each step has two choices Determine which statement best describes what you are looking at Follow that to the next step

Bellwork 8/23/13 1. An organism has dry scales covering its body. To which vertebrate group does it belong? A) amphibian B) Fish Mammal D) Reptile  2. List all characteristics of a living organism.