Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 19 - Self-Quiz - Page 316: 2


d. oxygen

Work Step by Step

Had free oxygen been present in the early atmosphere, this would have destroyed organic compounds as soon as they were made. This is because oxygen is a highly reactive element, and it would have quickly oxidized and broken up organic compounds that had formed.
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