Blastocyst
While the zygote is in the uterine tube (@ about day 4 ) it divides into a ball of 12 - 16 cells. Around the 10th day the inner portion of the zygote (blastocyst) implants into the uterine lining. The outer portion of the zygote becomes the placenta.
The zygote is most likely to become implanted and develop in the uterine lining, specifically in the endometrium, which is located in the upper section of the graph representing the uterus. This area is enriched with blood vessels and nutrients, providing an optimal environment for the zygote to implant and grow. Typically, this section is indicated in graphs depicting female reproductive anatomy and menstrual cycles.
After puberty, the vaginal lining becomes stratified squamous epithelium to allow fast diffusion of nutrients in case a zygote is implanted.
The answer to your question is a zygote. From there, it develops to an embryo and a foetus. Happy science!!!
The uterine lining builds-up in preparation for fertilization so that the zygote/embryo can implant itself into the uterine lining and then develop into a baby. Menstruation only takes place when fertilization doesn't take place, this occurs so the uterine lining is shed and can start a fresh next cycle so it can be ready for pregnancy again. If the uterine lining were to break down after fertilization a zygote/embryo wouldn't be able to implant itself or it would result in miscarriage.
The journey of the zygote from the fallopian tube to the implantation site in the uterus typically takes around 5-7 days. This journey involves the zygote traveling through the fallopian tube and reaching the uterine cavity, where it eventually implants itself into the uterine lining.
After fertilization, the egg and sperm fuse to form a zygote. The zygote undergoes multiple cell divisions, developing into an embryo. The embryo implants into the uterine lining, where it continues to grow and develop into a fetus.
A zygote becomes a fertilized egg when it is implanted. That grows into a fetus for the 9 months and is a baby after it is born.
In plant plot xD
The zygote begins to divide into a blastocyst around 4-5 days after fertilization. This process involves multiple cell divisions and leads to the formation of the blastocyst, which is essential for implantation into the uterine lining.
Implantation.
This process is called implantation. During implantation, the blastocyst embeds itself into the lining of the uterus, where it will continue to develop into an embryo.
A fertilized egg, or zygote, develops in the uterus of the female reproductive system. The zygote undergoes cell division and forms into a blastocyst before implanting into the uterine lining, where it continues to develop into an embryo and then a fetus.