Chapter 32.10, Problem 1SB

Summary Introduction

To review:

The reason for the mammals for being active only during nights in the Mesozoic era.

Introduction:

Mammals belong to the class Mammalia and they are the vertebrate animals. The characteristic feature of the mammals is the presence of mammary glands, hair, fur, and three middle ear bones. The mammary glands in females produce milk. Mammals come under the category of endothermic amniotes.