Embryonic development is divided into several stages:
Fertilization: The sperm and egg merge to form a zygote. Cleavage: The zygote undergoes rapid cell division without increasing in size. Blastocyst Formation: The cells form a hollow sphere, which then implants in the uterine wall. Gastrulation: The cells differentiate into three primary germ layers: ectoderm, mesoderm, and endoderm. Organogenesis: The formation of organs and tissues begins.
