Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 32 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 683: 5


This could mean several things. For one, the root of the Bilateral, to which “we” belong, sees one major branch being the acoelomate “worms,” and many of the phyla on the other branch are are worm-like. Also, the animals share at least one worm-like stage in development, the gastrula.

Work Step by Step

Skim the chapter, especially Fig. 32.11, and look for common worm-like features or ancestors to use as the basis for your answer.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.