Describe in sentences 5-7 the process of pregnancy in mammals from the moment of fertilization to the moment of birth.

Consider humans as the main representative of mammals. After fertilization of the female body and the fusion of the genetic material of a man and a woman, a zygote is formed. It contains a complete chromosome set. After a while, she begins to actively share. An embryo is formed. It has many body parts that were characteristic of the human ancestor. These are the chord, tail, gill slits and others. After a while, the embryo already begins to resemble a child. Intrauterine human development lasts about 9 months and consists of three trimesters.