Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 26 - The Origin and Diversity of Life - Review Questions - Understand: 5

Answer

B.

Work Step by Step

There is some uncertainty in the timing of the first life on Earth (B.), but it is before 3 BYA, but not 4 BYA (A.). C. and D. are wrong since the former came well after life began, and the latter might have some relevance in some cases, but the coal forests of the Carboniferous flourished during a warm wet time.
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