Where are Gases exchanged in a mammalian embryo?

The mammalian embryo exchanges gases with its mother through the placenta. Gases, like oxygen and carbon dioxide, diffuse between the fetus's and mother's bloodstream at the placental interface. This gaseous exchange is vital for supporting the embryo's growth and sustaining its overall health. However, this process of gas exchange only occurs in mammals or viviparous organisms with specialized structures resembling the placenta that connect the embryonic and maternal circulation.