Body line or cleavage line are lines that enable a surgeon to perform incision on a patient body easily because when a incision is made parallel on this line it enable the skin to gapes less and heals more readily and easily.
Surgical incisions made parallel on the line helps to improve healing and reduce scarring on the skin. This line are vital and important to surgeon during incision process because skin disorder can be avoided when the wound is totally healed especially when the surgeon used this procedure . Example If a pregnant woman had parallel incision, it will be a little harder for someone to easily detect or known after the wound has healed and closed.
The answer would be 2 placenta. A thin walled sac that surrounds the fetus during pregnancy. The sac is filled with amniotic fluid(liquid made by fetus) and the amnion(the membrane that covers the fetal side of the placenta)