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 (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 34 - Test Your Understanding - Levels 3-4 - Applying/Analyzing - Page 756: 6
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