A blastocyst is
A) an extraembryonic membrane that forms blood vessels.
B) a solid ball of cells.
C) a hollow ball of cells.
D) a portion of the placenta.
E) the membrane that forms the urinary bladder.

Question

Quizplus · Accepted Answer

A blastocyst is a stage of embryonic development that occurs after fertilization and includes the formation of a hollow ball of cells with an inner cell mass that will eventually differentiate into the embryo and its surrounding extraembryonic membranes.

A Blastocyst Is