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FROM THE PREFACE: Dramatic adjustments ensue within the body structure of such a lot animals in the course of their improvement. one of the vertebrates, birds are completely oviparous, dwell for variable classes in a cleidoic egg, and exhibit basic adjustments in excretion, food, and respiratory on the time of hatching. against this, the eutherian mammals are all viviparous, rely on the maternal move and a really good placenta to supply nutrients, trade gases, and discharge wastes.
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