Chapter 30.2, Problem 1NV

Summary Introduction

To determine:

Definition of the terms monotremes, marsupials, placental mammals, therapsids.

Explanation of Solution

The monotremes are mammals, which do not give birth to the young ones, instead, they lay eggs like other animals.

The marsupials are the members of the class Mammalia that have pouches. In these pouches, they carry their young ones. The marsupials are generally found in the Australian region.

Placental mammals carry their baby in the womb and they have a placenta that connects the baby to the mother.

Therapsids are reptiles like mammals that are considered to be the ancestors of modern mammals.