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 - Figure 52.5 - Inquiry Question: 1

Answer

There are advantages to live bearing in terms of the ultimate success of young, and thus of the parents in reproducing; these are probably hard to change so that natural selection reverses the course of evolution. Also, there are many complex structures needed for live-bearing, and it would be rare to reverse the appearance of these--many back mutations would be needed at once to return to successful egg-laying.

Work Step by Step

See here that there are complex structures requiring a long evolutionary history in the case of live bearing. Further, think about the evolutionary/reproductive advantages of live bearing.
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