Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 19, History of Life - Assessment - 19.1 The Fossil Record - Understand Key Concepts/Think Critically - Page 566: 4



Work Step by Step

The half-life of a radioactive sample is the time it takes for half of the atoms to decay. Half-lives of radioactive substances are used to date rocks and fossils.
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