Of the three germ layers,the mesoderm forms the most body parts.
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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
Q29: Surfactant production in premature infants is rarely
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
Q35: Implantation begins six to seven days after
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