1. Dichotomous Keys

2. Introduction
A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish.
"Dichotomous" means "divided into two parts". Therefore, dichotomous keys always give two choices in each step.

3. Hints: Use constant characteristics rather than variable ones.
Plants and animals often change with the seasons
Use measurements rather than vague terms like "large" and "small".
Make the choice a positive one
Something "is" instead of "is not"
If possible, start each pair of choices with the same word.
Finish the dichotomous key with a description of the organism.

4. Dichotomous key
Example of a dichotomous key…

5. Dichotomous Key
A dichotomous key can also be expressed in a diagrammatic form

6. Diagram for Shoe Dichotomous Key