Amniotic sac
It's a vacuole.
a vacuole
The amniotic sac is the membranous fluid filled bubble in which the developing foetus is suspended in utero.
Amnion
Amniotic sac
If a membrane-bound sac filled with large molecules of oil is suspended in a beaker of water, water will start to enter the sac. The sac will then swell.
Amniotic sac
The stomach
A closed sac with fluid in it
It's a vacuole.
balloon
a vacuole
an amnion
The amniotic sac is the membranous fluid filled bubble in which the developing foetus is suspended in utero.
its amniotic sac filled with amniotic fluid
Amnion