Chapter 30, Problem 18A

Summary Introduction

Introduction:

The mammals are the organism 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. Cetaceans are the aquatic mammals that are carnivore and large.

Answer to Problem 18A

Correct answer:

Option (B).

Explanation of Solution

Explanation/justification for the correct answer:

Option (B) Whales. The whales are the mammals, which are exclusively aquatic. They are huge, give birth to the young ones and feed them. Hence, the correct answer is option (B).

Explanation for incorrect answer:

Option (A) beaver. The beaver is a rodent and included in the order Rodentia. Hence, it is an incorrect answer.

Option (C) zebra. They belong to the family of horses and the order is Perissodactyla. Hence, it is an incorrect answer.

Option (D) manatee. The manatee are herbivore sea mammals belonging to the order Sirenia. Hence, it is an incorrect answer.