Two organ that a carbon dioxide molecule would pass though as it travels from foetus to mother?

The two organs that carbon dioxide molecule would pass through as it travels from a fetus to a mother are the placenta and the mother's bloodstream. In the placenta, maternal and fetal blood come close enough for gas exchange to occur, allowing the exchange of oxygen and carbon dioxide. Once carbon dioxide is transferred to the mother's bloodstream, it can be eliminated through her lungs via respiration.