Answer
a.
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.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
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
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