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Development of amniotic sac which surrounds the fetus during pregnancy and the formation of umbilical cord which connects the mother to the fetus for the exchange of nutrients and other waste materials.

Placenta is the flattened circular organ that is attached to the uterus that protects the fetus from mechanical shocks and other injuries...

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After the fertilization, the zygote formed passes down the oviduct and divides repeatedly to form small ball of cells. after 5 -6 days, these cells moves to the uterus and attaches to the wall of uterus. these mass cells are termed as embryo .. this growing embryo inside the uterus needs food and oxygen..it produces some nitrogenous wastes to be removed..these functions are performed by placenta. it looks like  a disc attached to the uterus.        
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hope its useful... if so pls mark it brainliest...
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