Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 26 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 570: 1



Work Step by Step

Having four limbs is clearly a character of all vertebrates, not just the two mentioned, making it ancestral (A), and B is wrong since it the opposite of A. C is wrong since a shared character cannot be used to separate the two groups, and D can be eliminated since the trait is from a common ancestor— homologous in these two organisms.
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