A human embryologist examines a 3-week-old embryo and notices that it has not developed a notochord. If the embryo survives, it will lack
A) a stomach and a pancreas.
B) a heart and lungs.
C) a brain and a spinal cord.
D) skin and blood vessels.
Correct Answer:
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Q51: _diffuse(s) from fetal blood to maternal blood
Q52: All cells in an animal, with the
Q53: The placental blood vessels
A) manufacture hormones that
Q54: The process through which a human embryo
Q55: The outer cell layer of the blastocyst
Q57: Which of these hormones stimulates the production
Q58: Suppose a pregnant woman took a drug
Q59: The last 7 months of pregnancy are
Q60: Most microbes cannot gain access to the
Q61: Yolk sacs are found only in animals
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