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give reasons why placenta has villi on embryo side

Reason:
Villi allows more area for the intake of food and oxygen from the mother's blood by the developing foetus. It also helps in the transfer of waste materials from the foetus to the mother's blood.

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to offer more surface area and to help in the transfer of food and other things between the embryo and the mother
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nice answer....................
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This is to decrease the time taken to transfer nutrients from the mother to the child
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thx
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