Answer
The red area shows the non-animal ancestors of animals.
Work Step by Step
The organisms would not currently be classified as animals, but are the ancestors of what are considered animals today. They lived 1B-770MYA.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 32 - 32.2 - Concept Check - Page 679: 2
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