Surfactant production in premature infants is rarely a factor in providing normal respiratory activity.
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Q24: The placenta and its attached fetal membranes
Q25: The embryo is directly enclosed in and
Q26: In fetal circulation,one way in which blood
Q27: A blastocyst is a hollow ball of
Q28: A zygote is usually formed within the
Q30: Of the three germ layers,the mesoderm forms
Q31: The embryonic period lasts until the end
Q32: Fertilization occurs while the egg is still
Q33: A pregnancy test involves antibodies that detect
Q34: By the end of the embryonic period,at
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