Biology 2010 Student Edition

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

Chapter 25, Introduction to Animals - Assessment - 25.2 Animal Body Plans and Evolution - Understand Key Concepts/Think Critically - Page 747: 25


The three germ layers are the endoderm, mesoderm, and ectoderm.

Work Step by Step

The endoderm, the innermost germ layer, gives rise to the lining of the digestive tract and respiratory system. The muscles and the organs of the circulatory, reproductive, and excretory systems arise from the mesoderm, the middle germ layer. The outer germ layer, the ectoderm, gives rise to the sense organs, nerves, and outermost skin layer.
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