Answer the following question given this paragraph: 

Blastocyst. The blastocyst consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast. The blastocyst fluid-filled cavity is also known as the blastocoel or blastocoele.


Q: What structure consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast?

 Choices:

- nucleus

- cytoplasm

- cell wall

- blastocyst

A:
blastocyst
