Chapter 21.16, Problem 2MC

Summary Introduction

To determine:

The evidence which supports that mammals show close evolutionary relationship with reptiles.

Concept introduction:

Mammals and reptiles both are the tetrapod vertebrates included under the phylum Chordata. Mammals and reptiles share a common ancestor, as both are amniotes. Mammals have unique feature of hair and mammary glands. Reptiles have scaly skin and three chambered hearts except crocodiles.