Which of the Following is an Embryo That is Hollow

Question

Which of the following is an embryo that is hollow sphere of cells with a fluid-filled cavity?
A) Blastocyst
B) Morula
C) Gastrocyst
D) Zygote

Accepted Answer

A blastocyst is an early stage of embryonic development in mammals, characterized by a hollow sphere of cells with a fluid-filled cavity called the blastocoel.