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How do embryos of placental mammals excrete nitrogen wastes?
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- Why do mammals excrete nitrogenous waste in the form of urea rather than ammonia or uric acid?Describe the developmental stages of kidneys in amniotes. How does the developmental sequence for amniotes differ from that of amphibians and fishes?What is chief nitrogenaus waste product in birds? Give two advantages of this mode of excretion.