Biology (11th Edition)

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

Chapter 52 - The Reproductive System - Review Questions - Synthesize: 2

Answer

External fertilizers can mate and lay eggs in the water, while internal fertilizers can't and, thus, have evolved an internal water-filled space for this purpose.

Work Step by Step

You can see this in how the amniotes moved further onto/into dry land. They needed a wet place for sperm to swim, so they made it internally.
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