Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 50 - 50.3 - Concept Check - Page 1117: 1

Answer

Planarians can detect light, but they cannot visualize images like flies can.

Work Step by Step

Flies have a much greater need to be able to visualize in order to navigate their environments, something that planarians do not necessarily need. The detection of light is sufficient for their purposes without having delicate eyes to protect.
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