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 317: 8



Work Step by Step

When the cyanobacteria released oxygen into the atmosphere as a byproduct of photosynthesis, the oxygen started accumulating, raising the amount of atmospheric oxygen. This created a selection pressure on organisms at that time, favoring those individuals that were able to survive in the toxic oxygen environment.
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