Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 31, Problem 5TYK

Which organ system is absent in flatworms (phylum Platyhelminthes)?

a. nervous system

b. reproductive system

c. circulatory system

d. digestive system

e. excretory system

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