How do the embryos of placental mammals excrete nitrogenous wastes?
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Answer:
The nitrogenous waste of the foetus passes through the placenta in the blood of the mother from where it is excreted with the nitrogenous waste from the mother's body.
Explanation:
The foetus is connected with the mother through an embryonic cord and the placenta. The nitrogenous waste from the foetus passes into the bloodstream of the mother and then passed along with the mother's waste.
The placenta not only is useful in getting rid of the nitrogenous waste but it also helps in providing nutrition to the foetus through the blood of the mother.
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