Blastocyst implantation close to internal os causes-
Ans. is 'a' i.e., Placenta Previa Placenta Previao When the placenta is implanted partially or completely over the lower uterine segtnent, over and adjacent to the internal os, it is called placenta previa.
Placenta previa
Placenta Percreta
Placenta increta
Abruptio
Placenta Previa