Campbell Biology (11th Edition)

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

Chapter 32 - 32.2 - Concept Check - Page 677: 2


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.
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