Which Structure is a Solid Ball of Cells That Forms

Question

Which structure is a solid ball of cells that forms about 3 days after fertilization?
A) blastocyst
B) embryo
C) zygote
D) morula

Accepted Answer

The morula is a solid ball of cells that forms about 3 days after fertilization, before developing into a blastocyst. The zygote is the fertilized egg cell, and the embryo is the stage of development after the blastocyst has implanted in the uterus.