Chapter 30, Problem 2A

Summary Introduction

To fill:

The correct term in the given blank.

Introduction:

The mammals are the organisms that carry the babies in their wombs and give birth to the young ones. In initial days, the young ones are fed by the milk produced in the mammary glands of these organism.

Answer to Problem 2A

Gestation.

Explanation of Solution

The incubation period in the birds is the time taken from the fertilization to the development of the egg completely into young one and hatching. Similarly, the gestation period in mammals is the time between the fertilization and the birth of the baby. In the gestation period, the developing embryo is in the body of the mother.