The umbilical cord in mammals contains:

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(C) The umbilical cord is a flexible structure that connects the fetus to the placenta. It contains two umbilical arteries and one umbilical vein,whic

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Allantoic artery and vein

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(C) The umbilical cord is a flexible structure that connects the fetus to the placenta. It contains two umbilical arteries and one umbilical vein,which are derived from the allantoic vessels. These vessels are responsible for the transport of oxygenated blood and nutrients from the placenta to the fetus,and deoxygenated blood and waste products from the fetus back to the placenta.

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