Answer:
The thin layer known as amniotic sac which is filled with amniotic fluid surrounds and protects the fetus during the pregnancy.
Step-by-step explanation:
- A thin-walled sac that surrounds the fetus during pregnancy.
- The sac is filled with liquid made amniotic fluid which is made by the fetus .
- This protects the fetus from injury.
- It also helps to regulate the temperature of the fetus.