Biology 2010 Student Edition

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: 16


b .

Work Step by Step

Option a. is incorrect. A vestigial structure is one that used to have a specific function in an ancestor organism but now no longer has a function. Option c. is incorrect. Speciation is the development of a totally different species through evolutionary means. Option d. is incorrect. Analogous structures are similar structures that develop separately in two different species. Option b. is correct. An adaptation is a trait that is passed down from an ancestor to its descendants that increase an organism's fitness or the ability to survive and reproduce.
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