By Felix Bronner, Felix Bronner, Mary C. Farach-Carson
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FROM THE PREFACE: Dramatic adjustments take place within the body structure of such a lot animals in the course of their improvement. one of the vertebrates, birds are completely oviparous, stay for variable classes in a cleidoic egg, and convey basic adjustments in excretion, nutrients, and breathing on the time of hatching. against this, the eutherian mammals are all viviparous, rely on the maternal circulate and a really expert placenta to supply meals, alternate gases, and discharge wastes.
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