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.
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
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
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