By Esequiel E. Rodriguez Yanez ; Coauthors, Larry White ... [et al.].
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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 totally oviparous, dwell for variable classes in a cleidoic egg, and express basic adjustments in excretion, food, and respiratory on the time of hatching. against this, the eutherian mammals are all viviparous, depend upon the maternal move and a really expert placenta to supply foodstuff, alternate gases, and discharge wastes.
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