Answer
a.
Work Step by Step
The ability of an organism to survive and reproduce in a certain environment is called its fitness. Even if an organism is apparently healthy, it may have low fitness because it does not have viable offspring.
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 16, Darwin's Theory of Evolution - Assessment - 16.3 Darwin Presents His Case - Understand Key Concepts - Page 176: 17
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