Answer
Placenta is composed of dual layers. These layers allow simultaneous passing of the mother's blood and the embryo's blood without mixing with each other.
Work Step by Step
As above
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 34, Endocrine and Reproductive Systems - Assessment - 34.4 Fertilization and Development - Understand Key Concepts/Think Critically - Page 1005: 30
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