Answer:
The correct answer is ''outer cells of the blastocyst'' The placenta and umbilical cord will derive from the trophoblast and from the internal cell mass all the tissues that will form the embryo.
Explanation:
The umbilical cord and the placenta are two fundamental organs for the development of the fetus, both come from the same initial cell as the fetus and for this reason they share a lot of genetic information with it. The placenta joins the wall of the uterus which is where the umbilical cord arises. As a general rule, it is attached to the upper, lateral, anterior or posterior part of the uterus. In some rare cases, the placenta can join the lower uterus, causing what is called placenta previa. The placenta begins to form at the same time that the fertilized ovum implants in the wall of the uterus and is essential for the correct development of the embryo, since it is through it and the umbilical cord to which it is subject that the fetus maintains the connection with the mother and receives all the nutrients it needs, in addition to the blood and oxygen it needs to breathe. The outer part of the placenta comes from the transformation of the uterus mucosa, while the inner part, called trophoblast, is configured from the embryo's own blasts, establishing a complex network of blood vessels, through which the fetus you will receive the nutrients you need. Also from the trophoblast, the chorionic plate is formed, in which the chorionic villi are located, which allow the embryo to attach to the wall of the uterus.
