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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 24, Problem 8SQ
Textbook Problem
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Which invertebrate phylum includes the most species?

  1. a. mollusks
  2. b. roundworms
  3. c. arthropods
  4. d. flatworms

Summary Introduction

Concept introduction: Invertebrates are animals that lack notochord. Invertebrates include variety of organisms with varied characteristics. The invertebrates are more in number than the vertebrates.

Explanation of Solution

Reason for correct answer:

The arthropods include several animals that are aquatic, terrestrial and volant. The arthropods are the largest phylum that makes up 84% of the total population of animals on earth. The insect species (that are arthropods) alone outnumbers most of the animal population. The scientists have estimated that there are approximately 5.5 million insect species.

Option c. is given as “arthropods”

As arthropods that are invertebrate phylum constitute most of the animal species on earth, the correct answer is option c.

Reason for incorrect answer:

Option a. is given as, “mollusks”.

The arthropods houses 84% of world animal species and not mollusks...

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