PATHOLOGY

Detailed explanation-1: -The four essential processes by which a multicellular organism is made: cell proliferation, cell specialization, cell interaction, and cell movement. In a developing embryo, all these processes are happening at once, in a kaleidoscopic variety of different ways in different parts of the organism.

Detailed explanation-2: -"Embryo: the developing organism from the time of fertilization until significant differentiation has occurred, when the organism becomes known as a fetus."

Detailed explanation-3: -Fertilization. Fertilization is the union of the female gamete (egg) and the male gamete (spermatozoa). Blastocyst Development. Blastocyst Implantation. Embryo Development. Fetal Development.