By Lionel Bender, Facts on File
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FROM THE PREFACE: Dramatic adjustments take place within the body structure of so much animals in the course of their improvement. one of the vertebrates, birds are solely oviparous, dwell for variable classes in a cleidoic egg, and convey primary adjustments in excretion, foodstuff, and respiratory on the time of hatching. by contrast, the eutherian mammals are all viviparous, depend upon the maternal circulate and a really good placenta to supply meals, alternate gases, and discharge wastes.
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