By Singh S., Ernst E.
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FROM THE PREFACE: Dramatic alterations ensue within the body structure of so much animals in the course of their improvement. one of the vertebrates, birds are totally oviparous, reside for variable sessions in a cleidoic egg, and exhibit basic changes in excretion, food, and respiratory on the time of hatching. by contrast, the eutherian mammals are all viviparous, rely on the maternal stream and a really expert placenta to supply nutrients, alternate gases, and discharge wastes.
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