(Classification Key)
 A tool used for identifying unfamiliar
organisms
 A list of observable traits that eventually lead
you to the name of the organism
 Observable traits are used to distinguish
between the different organisms
 Can find keys for various organisms in public
libraries
Simpsons Dichotomous Key:
1. a. Wearing red shoes……………………………….Go to 2
b. Not wearing red shoes …………………………..Go to 3
2. a. Has blue hair …………………………………… Marge
b. Hair is not blue ………………………………… Lisa
3. a. > 4 ft. ………………………………………….. Homer
b. ≤ 4 ft. ………………………………………….. Go to 4
4. a. Is wearing a bow ……………………………… Maggie
b. Is not wearing a bow ………………………….. Bart