Embryogenesis

The process through which a single cell transforms into a complex creature is called embryogenesis. It encompasses the development of organs, tissues, and other structures as well as the proliferation and differentiation of cells. Fertilization, in which the egg and sperm join to create a zygote with one cell, is the first stage of embryogenesis. After then, the zygote starts to split, creating a blastula. The blastula matures into a blastocyst over the course of many weeks, and the blastocyst implants in the uterus. After being implanted, the blastocyst starts to develop into the ectoderm, mesoderm, and endoderm, the three germ layers of the embryo. These three germ layers will later develop into the different organs, tissues, and other bodily systems. Embryogenesis is a difficult and involved process.