MICROANATOMY

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: -The zygote undergoes a series of cell divisions (called cleavage) to form a structure called a morula. The morula develops into a structure called a blastula through a process called blastulation. The blastula develops into a structure called a gastrula through a process called gastrulation.