By Daniel M. Barr, Eric Gambrill, John Fry (auth.), Dr John Fry (eds.)
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FROM THE PREFACE: Dramatic alterations ensue within the body structure of such a lot animals in the course of their improvement. one of the vertebrates, birds are solely oviparous, stay for variable classes in a cleidoic egg, and convey basic changes in excretion, foodstuff, and breathing on the time of hatching. by contrast, the eutherian mammals are all viviparous, depend upon the maternal move and a really good placenta to supply nutrition, alternate gases, and discharge wastes.
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