Oxygenated blood flowing in umbilical cord of mammalian embryo is.
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Answer: Blood flowing in mammalian umbilical cord is foetal (it is 100% deoxygenated). The Umbilical cord can be referred as the exception where the arteries carry the deoxygenated blood and the veins carry oxygenated blood. The umbilical cord can be referred as the life-line which attaches placenta to fetus
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