The ________ is a Hollow Ball of Cells

Question

The ________ is a hollow ball of cells.
A) blastocyst
B) gastrula
C) morula
D) embryo
E) None of the answers are correct.

Accepted Answer

The blastocyst is the early stage of embryonic development characterized by a hollow ball of cells with an inner cell mass, which will eventually form the embryo. The morula is an earlier stage of development that consists of a solid ball of cells. The gastrula is a later stage of development where the blastula is transformed into a three-layered structure. The embryo is the developing organism after fertilization. Therefore, only option A accurately describes a hollow ball of cells.