Following fusion of the chorioamniotic folds, the amnion has formed by day ___. As in all species, the amnion is initially tightly adherent to the embryo. The amniotic sac later enlarges to accommodate the increasing volume of amniotic fluid. At partus, the amniotic fluid volume amounts to ____ ml in the dog, but is considerably ____in the cat. No amniotic plaques are formed in either species.