Biology (11th Edition)

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

Chapter 44 - Sensory Systems - Review Questions - Synthesize: 2

Answer

In the vertebrate eye, the light travels first through several layers of cells above the retina, which then sends a nerve signal back to them and then to the brain. In contrast, the mollusk retina is found as the first layer with which light interacts.

Work Step by Step

This difference in the position of the retina highlights the parallel evolution of vertebrate and mollusk eyes.
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