The ________ is formed by the allantois,blood vessels,and yolk sac.
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Q108: Identical twins that share body structures are
Q109: The blood vessels that carry deoxygenated blood
Q110: The process by which a viable embryo
Q111: The blood vessel that carries oxygenated blood
Q112: Twins that occur when blastomeres separate are
Q114: Placental functions are concentrated in a disc-shaped
Q115: Uterine contractions that are irregular and brief
Q116: Blood flows to the placenta through _
Q117: The _ stage is the stage of
Q118: Events in the first 12 weeks of
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