FROM THE PREFACE: Dramatic adjustments take place within the body structure of so much animals in the course of their improvement. one of the vertebrates, birds are completely oviparous, reside for variable sessions in a cleidoic egg, and convey primary adjustments in excretion, foodstuff, and breathing on the time of hatching. against this, the eutherian mammals are all viviparous, rely on the maternal stream and a really good placenta to supply meals, trade gases, and discharge wastes. The body structure of either mom and fetus is very really expert in the course of gestation and alterations essentially on the time of delivery. Fishes exemplify either the oviparous and the viviparous modes of improvement, with a few examples which are intermediate among the 2. In those volumes, chosen studies of many, yet now not all, facets of improvement are offered. The chapters partially A relate to the body structure of eggs and larvae; these partly B challenge viviparity and the body structure of posthatching juvenile fishes.
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