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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 25, Problem 12SQ
Textbook Problem
11 views

______ have scaleless skin and a heart with three chambers.

  1. a. Amphibians
  2. b. Mammals
  3. c. Ray-finned fishes
  4. d. Snakes

Summary Introduction

Concept introduction: The skin is the outermost covering of the body. Based on the habitat involved, the nature of the skin varies from species to species. As the animals evolved, the complexity also increased. As the complexity increased, the number of the chambers of heart also increased in order to give sufficient blood supply and also transport the molecules across organ systems.

Explanation of Solution

Reasons for the correct statement:

The amphibians are aquatic and terrestrial in habit. They have a moist skin that always secretes mucous to survive in the terrestrial habitat. Therefore, they don’t require a scaled skin. The amphibians have the three-chambered heart with two auricles and one ventricle.

Option a. is given as “amphibians”

As the amphibians have moist scaleless skin and the three-chambered heart, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “Mammals”...

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