The stage of embryonic development ends when __________

A) the child is born.
B) the internal organs begin to form.
C) bone cells begin to form.
D) the fertilized egg attaches to the uterine wall.

Embryonic Development

The process by which the embryo forms and develops, starting from fertilization through to the fetal stage.

Bone Cells

Specialized cells that compose bone tissue, responsible for the formation, maintenance, and remodeling of bones.