Respuesta :

koredeyusuf799

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

suzette1969
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.