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: 12



Work Step by Step

Stromatolites are layers of sediment and photosynthetic bacteria found in shallow water illuminated by sunlight. The bacteria trap sediment and minerals around them. When sediment covers these bacteria, new bacteria form over the old sediment-covered bacteria. The new bacteria continue to trap sediment, thus forming another layer.
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