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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 9SQ
Textbook Problem
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Among living animals, only birds have ___ .

  1. a. a cloaca
  2. b. 1mmiote eggs
  3. c. feathers
  4. d. a four-chambered heart

Summary Introduction

Concept introduction: The chordates have aquatic adaptation, terrestrial adaptation, and volant adaptation to suit their habitat. The birds have the volant adaptation that is their mode of locomotion is flying with the help of wings made of feathers. There are other animals that have the volant adaptations but their wings are not made of feathers.

Explanation of Solution

Reason for the correct answer:

The animals that can fly are included with insects amongst the invertebrates and flying fishes like Exocetus, flying reptiles like Draco, birds, and flying mammals like bats. The birds have the volant adaptation that was made possible with the help of wings. The wings of birds are made of feathers. Among the living animals, birds are only having feathers.

Option c. is given as “feathers” and since the birds fly with the help of feathers that constitutes the wings, the correct answer is option c.

Reasons for the incorrect answers:

Option a. is given as “a cloaca”. Amongst the living animals, fishes, amphibians, reptiles, and birds have cloacae, a common opening for excretion and release of gametes...

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