Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 18, Classification - Standardized Test Prep - Page 535: 10

Answer

Scientists relied on body structure, but the problem was there were some very different organisms that evolved with similar structures, making classification hard.

Work Step by Step

Scientists relied on body structure, but the problem was there were some very different organisms that evolved with similar structures, making classification hard.
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