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(D) In mammals,the placenta is a specialized organ that connects the developing fetus to the uterine wall. It is essential for the effective reproduct

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Formation of placenta

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(D) In mammals,the placenta is a specialized organ that connects the developing fetus to the uterine wall. It is essential for the effective reproduction of mammals because it facilitates the exchange of nutrients,oxygen,and waste products between the mother and the fetus. This allows for the internal development of the fetus,providing protection and a stable environment,which significantly increases the survival rate of the offspring.

To ensure the effectiveness of reproduction in mammals,which of the following is essential?

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