Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 51 - The Immune System - Review Questions - Synthesize: 4

Answer

Innate immunity must have arisen very early among animals and diversified with them. The fact that cnidarians, some of the simplest animals (such as jellyfish) have them places their origin very early in the history of the animal kingdom.

Work Step by Step

The question is asking you to think back to the chapters on genetics and on the history of life and apply that information here to see the ancient origin of immune systems in animals.
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