By Stanley Davidson, Sir; J Alastair Innes
Illnesses & issues
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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 fullyyt oviparous, reside for variable sessions in a cleidoic egg, and exhibit primary adjustments in excretion, nutrients, and breathing 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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