Implantation occurs during the _____ stage.
A) zygote
B) morula
C) blastocyst
D) trophoblast

Question

Quizplus · Accepted Answer

Implantation occurs during the blastocyst stage, which is the stage when the embryo has developed into a ball of cells with a fluid-filled cavity inside. During implantation, the blastocyst attaches to the lining of the uterus and begins to invade it, which ultimately allows for the formation of the placenta. The zygote is the initial cell formed by the fusion of the egg and sperm, the morula is a solid ball of cells that forms after the zygote has undergone multiple cell divisions, and the trophoblast is the outer layer of cells in the blastocyst that gives rise to the placenta.

Implantation Occurs During the _____ Stage