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FROM THE PREFACE: Dramatic changes occur in the physiology of most animals during their development. Among the vertebrates, birds are entirely oviparous, live for variable periods in a cleidoic egg, and show fundamental alterations in excretion, nutrition, and respiration at the time of hatching. In contrast, the eutherian mammals are all viviparous, depend on the maternal circulation and a specialized placenta to provide food, exchange gases, and discharge wastes. The physiology of both mother and fetus is highly specialized during gestation and changes fundamentally at the time of birth. Fi

597 --- 591.31 --- 591.32 --- 591.34 --- 591.567 --- 639.3.041 --- Pisces. Fishes. Ichthyology --- Primary development of the egg. Fertilization. Segmentation etc. --- Formation of the embryonic rudiments --- Metamorphosis. Larval stage --- Viviparity --- Hatching out --- 591.32 Formation of the embryonic rudiments --- 591.31 Primary development of the egg. Fertilization. Segmentation etc. --- 597 Pisces. Fishes. Ichthyology --- 591.567 Viviparity --- 591.34 Metamorphosis. Larval stage --- Fishes --- Zoology. --- Biology --- Natural history --- Animals --- Physiology. --- Fish eggs --- Fish roe --- Ichthyoplankton --- Roe of fishes --- Eggs. --- Roe