Campbell Biology (11th Edition)

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

Chapter 34 - Test Your Understanding - Level 2 - Application/Analysis - Page 754: 6

Answer

A

Work Step by Step

B. and C. are wrong since they precede A. in the history of life, and D. comes after the tetrapods have appeared.
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