how do embryos of placental mammals excrete


How do embryos of placental mammals excrete nitrogen wastes?

Placental animals, as well as embryos, excrete urea. In the adult placental mammal urea is excreted by the urine. In embryos the molecule passes to the mother's blood by the placenta and it is excreted in the mother's urine.

 

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Biology: how do embryos of placental mammals excrete
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