Define Placenta?

Placenta is

Placenta is

Explain the Placenta

Define the following/Give meaning of the following: Placenta:

Placenta || Types OF Placenta Harmones Secreted by Placenta || Functions OF Placenta

Embryo Development|Placenta |Placenta And Its Functions|Gastrulation

Extra Embryonic Membrane in Human || Yolk Sac || Placenta || General Introduction || Structure OF Placenta || Classification OF Placenta

What is Placenta ? Write four functions of Human Placenta.