Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 32 - Deuterostome Animals - 32.4 - Life on Land Contributed to Vertebrate Diversification - 32.4 Recap - Learning Outcomes - Page 707: 1

Answer

The amniotic egg allows for the development of the embryo within a semipermeable sac. The old contains ample food for the developing fetus and the calcified shell facilitates gas exchange, allowing the embryo to reach a advanced stage of development before hatching. The mammalian amniotic sac allows the animal to exchange gases and wastes with the mother's body. Both adaptations are an essential step in the transition for the animal to live on land.

Work Step by Step

The amniotic egg allows for the development of the embryo within a semipermeable sac. The old contains ample food for the developing fetus and the calcified shell facilitates gas exchange, allowing the embryo to reach a advanced stage of development before hatching. The mammalian amniotic sac allows the animal to exchange gases and wastes with the mother's body. Both adaptations are an essential step in the transition for the animal to live on land.
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