Derived Characteristics Of Organisms
Organism	Derived Character
	Backbone	Legs	Hair
Earthworm	Absent	Absent	Absent
Trout	Present	Absent	Absent
Lizard	Present	Present	Absent
Human	Present	Present	Present

1. Identify the organism in the table that is least closely related to the others.

2. Construct a Cladogram based on the information provided in the table.

Questions:

1. What trait separates the least closely related animals?
2. Does your cladogram indicate that lizards and humans share a more recent common ancestor than either does with an earthworm? Explain.
3. Where would you insert a frog if you added it to your cladogram? Explain.

This activity is derived from page 453 Prentice Hall BIOLOGY, 2004