Chapter 21.4, Problem 2R

Summary Introduction

To review:

The classification of the tree according to the possible classification which contains a polyphyletic group.

Given:

The table below shows the three types of classifications of the groups:

Classification one:
Named group Amphibian Mammalia Reptilian Aves	Included taxa Frogs, salamanders, and caecilians Mammals Lizards, turtles, and crocodiles Birds
Classification two:
Named group Amphibia Mammalia Reptilian	Included taxa Frogs, salamanders, and caecilians Mammals Lizards, turtles, crocodiles, and birds
Classification three:
Named group Amphibian Homothermia Reptilia	Included taxa Frogs, salamanders, and caecilians Mammals and birds Lizards, turtles, and crocodiles

Introduction:

The biological classification describes the relationship of the evolution of the organisms. There are three types of classification category. They are monophyletic, polyphyletic, and paraphyletic. Monophyletic is the group which has an ancestor and all the descendants are of the ancestor. Polyphyletic is the group which does not include the common ancestors in the group. Paraphyletic is the group which includes ancestors but some of the descendants are of the ancestors.