The organ that serves as an exchange between maternal and fetal blood during pregnancy is the placenta. It facilitates the transfer of essential nutrients and waste products between the mother and fetus. Other options like the corpus luteum and cervix have different functions in pregnancy. ;
The placenta is the organ responsible for the exchange of maternal and fetal blood during pregnancy, facilitating the transfer of nutrients, gases, and waste. Other options, such as the corpus luteum and cervix, have different functions and do not contribute to this exchange. Therefore, the correct answer is C. Placenta .
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