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Biology: The Unity and Diversity o...

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

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 25, Problem 11SQ
Textbook Problem
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Unlike Archaeopteryx, modem birds have ______ .

  1. a. a long bony tail
  2. b. a toothless beak
  3. c. a two-chambered heart
  4. d. feathers

Summary Introduction

Concept introduction: Archaeopteryx is a fossil bird and is ancestral from which the modern birds have evolved. The Archaeopteryx and the modern birds share several similar features. The Archaeopteryx is said to be evolved from the reptiles.

Explanation of Solution

Reasons for the correct statement:

The Archaeopteryx is a feathered therapsid dinosaur that gave rise to modern birds. The modern birds and Archaeopteryx share several similar features and differ by several feathers. The fossils of Archaeopteryx excavated first from Berlin, showed that they had feathers, long bony tail, and toothed beak. The modern- day birds also have feathers and long body tail covered by the feather but they lack a toothed beak. The toothed beak of Archaeopteryx is the characteristic of therapsid mouth. Modern birds lost the tooth during evolution.

Option b. is given as “a toothless beak”

As modern day birds lack toothed beak contrasting to the Archaeopteryx, Therefore option b. is correct...

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