Final answer:
The subject of this question is Embryology. Embryology is the study of the development of an embryo from the fertilized egg to the formation of tissues and organs.
Step-by-step explanation:
The subject of this question is Embryology. Embryology is the study of the development of an embryo from the fertilized egg to the formation of tissues and organs. In embryology, we learn about the three germ layers - ectoderm, mesoderm, and endoderm - which give rise to different types of cells and tissues in the body.