So these three factors actually facilitate the exchange of gases inside our placenta. So we have the the ability of that fetal hemoglobin to actually bind to oxygen much more readily than the adult hemoglobin. That is factor number one. Factor number two is the fact that inside the mother we have a higher amount of oxygen than inside the fetus. And so it moves down its concentration and pressure gradient from the mother's side to the fetus side. And finally, we also have the double bore effect.