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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 24, Problem 6SQ
Textbook Problem
264 views

Earthworms are most closely related to _______.

  1. a. tapeworms
  2. b. roundworms
  3. c. planarians
  4. d. leeches

Summary Introduction

Introduction: Annelids are group of animals that are bilaterally symmetrical and exhibit metamerism (conspicuous segmentation). Annelids include animals like earthworms, leeches, and nereis. Animals grouped in a single phylum share several similar characteristics and are more closely related than other phyla.

Explanation of Solution

Reason for the correct statement:

Earthworms belong to Phylum: Annelida. The annelids are the first group of highly specialised animals. The annelids include there classes: polychaetes, oligochaetes, and hirudinea. They all have characteristic segmentation.  The earthworm belongs to oligochaetes and the leeches belong to hirudinea. The earthworm and leeches share a common ancestor and have similar morphological and anatomical features that again suggest that they are closely related to each other.

Option d. is given as “leeches”.

As earthworms share a close relationship with leeches than they do with roundworms, tapeworms, and planarians, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “tapeworms”.

Tapeworms belong to Phylum: Platyhelminthes. Earthworms belong to Phylum: Annelida. The tapeworms and the earthworms have several varying characteristics morphologically and anatomically...

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