Q: What is the membrane that surrounds a fetus called?


Read this paragraph and choose the correct option from the provided answers:

The amniotic sac is a membrane that surrounds the fetus. It is filled with water and dissolved substances, known as amniotic fluid. Imagine placing a small plastic toy inside a balloon and then filling the balloon with water. The toy would be cushioned and protected by the water. It would also be able to move freely inside the balloon. The amniotic sac and its fluid are like a water-filled balloon. They cushion and protect the fetus. They also let the fetus move freely inside the uterus.

 Choices:

- cell membrane

- umbilicus

- umbilical sac

- amniotic sac


A:
amniotic sac