4 days as the organs turn to liquid and the body bloats, I’d have to say the abdomen would be the least visible thing showing that the body has already passed days ago,
Also, are you studying forensics?
If so awesome! I wanna work on that field, but physiology always seemed easier and more fun.
Answer:
The amniotic sac and its filling provide a liquid that surrounds
and cushions the fetus . It is a site of exchange of essential
substances, such as oxygen, between the umbilical cord and the
fetus. It allows the fetus to move freely within the walls of the
uterus. Buoyancy is also provided
Pulmonary artery carry blood from the right ventricle of the heart to the lungs for oxygenation.
I believe the Endoplasmic reticulum since it is responsible for protein transport
Active transport moves molecules from HIGH to LOW concentrations