The prenatal support system-the amniotic sac, placenta, and umbilical cord-are fully formed by the
A) end of the period of the zygote.
B) end of the first month of prenatal development.
C) end of the period of the embryo.
D) beginning of the third trimester.
Correct Answer:
Verified
Q18: The ectodermal cells develop into
A) the heart.
B)
Q19: The mesodermal layer eventually gives rise to
Q20: By the end of the third week,
Q21: Which of the following is correct?
A) The
Q22: By the end of the eighth week
Q24: The embryo grows within the _, a
Q25: One function of the amniotic sac is
Q26: The exchange of materials between the fetus
Q27: The placenta serves as a natural filter
Q28: The period of the fetus begins
A) at
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