What is the role of placenta in embryo development?

What is the role of placenta in embryo development ?
A. 1)’ Placenta is a tissue formed by the cells from the embryo and the mother.
2) It is formed at around 12 weeks of pregnancy and becomes an important structure
for nourishment of the embryo. ’
3) Placenta is a disc which is embedded in the uterine wall. It contains villi on the embryo’s side of the tissue.
4) On the mother’s side are blood spaces, '
5) This provides a large surface area for diffusion of glucose, oxygen and other nutrients from the mother of the embryo.

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It also helps in ecreation of waste materials from the body of foetus from the womb of mother