Amnion. It starts out as the Second Layer of cells in the Zygote/Fert Egg.
the fetus is in the yolk sac
No, a sac grows to accommodate the fetus and if the fetus us dead it does not grow anymore.
The protective sac around the embryo or fetus is the amniotic sac.
Amniotic sac and fluid has a protective functions for the fetus. This sac separates the fetus from the mothers tissue.
sac in which the fetus develops in amniotes
The fetus is enclosed in the amniotic sac, which is a fluid-filled membrane that provides protection and cushioning during pregnancy.
The fluid-filled sac surrounding the developing embryo or fetus is called the amniotic sac. It is filled with amniotic fluid that protects and cushions the fetus, helping to regulate its temperature and provide room for movement.
The Amniotic Sac is the sac that contains the baby.
the womb or amniotic sac
fetus
placenta
amniotic sac