Answer
b. Two
Work Step by Step
From the table, we can observe that at Half Life 2, Uranium is 25% and Lead is 75%; hence, there is three times more lead as compared to Uranium.
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 - Analyzing Data - Page 568: 39
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